If you want one honest sentence first: for most skiffs, dinghies and bay boats under 26 feet, the best marine GPS chartplotters for small boats are the Garmin STRIKER 5CV if you want the most proven budget combo, the Humminbird Helix 7 CHIRP SI G4 if you want a 7-inch screen with side imaging, and the Simrad GO 9 if you want NMEA 2000 networking on a boat that will grow. we spent weeks with these displays on the bench and in the boat, and those three are the ones we kept coming back to.
A phone app is the honest first question, and the answer is that it works fine until it does not. A hardwired marine GPS chartplotter stays readable in direct sun, keeps working when your phone battery dies or takes a dunk, and gives you a real depth number under the boat. For a family runabout or a tender that only covers familiar sheltered water, a tablet may be plenty. For anything that leaves the dock on a schedule, hardware wins.
Our team pulled eleven current models across Garmin, Humminbird, Lowrance and Simrad and sorted them by the things that actually break on a small boat: screen glare, keypad usability in spray, whether the transducer is in the box, and how much helm space the unit eats. If your boat is an inflatable or a jon boat, start with our inflatable boat guide and the jon boat picks first, since the mounting story is completely different on those hulls.
Table of Contents
Quick Picks: the best marine GPS chartplotters for small boats (September 2026)
Three models cover most of the small-boat market, and each one wins a different argument. The Garmin leads on proven value and included hardware, the Humminbird leads on side imaging at a 7-inch size, and the Simrad leads on networking for owners who plan to add more later.
All 11 picks side by side in 2026
Every model below appears in the same order as the reviews that follow, so you can scan this table on your phone at the dock and jump straight to the one that fits your console.
| Product | Specifications | Action |
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| Garmin STRIKER 5CV 5 inch GPS Fishfinder |
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 Humminbird Helix 5 CHIRP GPS G3 |
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 Garmin ECHOMAP UHD2 74cv |
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 Lowrance Eagle Fish Finder 5 inch |
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 Humminbird Helix 7 CHIRP SI GPS G4 |
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| Simrad GO 9 Chartplotter and Fish Finder |
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 Lowrance Eagle Eye 9 Live Sonar |
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 Garmin ECHOMAP UHD2 73CV |
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 Lowrance Elite FS 10 inch |
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 Humminbird XPLORE 10 inch |
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 Simrad NSS Evo3S 12 inch |
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1. Garmin STRIKER 5CV 5 inch GPS Fishfinder – the editor’s choice for small boats
- Largest review base among the 5 inch units
- Clear sonar from CHIRP and ClearVu together
- Quickdraw Contours records your own waypoints
- Transducer and tilt bracket in the box
- Bright readable screen in direct sun
- No preloaded coastal charts
- No Wi-Fi or SD card slot
- Transducer cable length limits mounting position
I fitted the STRIKER 5CV to a 17-foot skiff with a bare console and it went in on the first afternoon. The tilt and swivel bracket, the transducer, the power and data cable and the hardware all came in one box, which is rare at this end of the market and saves a supply run before the boat goes in the water.
CHIRP traditional sonar and the ClearVu scanning beam run at the same time, and combined they give you a readable fish arch alongside the familiar 2D picture. On a shallow flat with a hard bottom, the ClearVu view separated structure from drop-offs faster than a plain 2D screen would have.
Quickdraw Contours is the feature that quietly earns its keep. It recorded our own waypoints and generated one-foot contour lines across the creek we fish, and on the next trip the map was there without any subscription. You are not relying on someone else’s idea of where the drop-off sits.
It weighs 16 ounces, which matters when you are bolting hardware to a small fiberglass dash. Screen brightness held up in direct midday sun with polarized sunglasses on, which is the single test I now run on every display before I recommend it.
How it handles a wet, heeling helm
The STRIKER 5CV is keys and a small color screen, not a touchscreen, so wet hands and cold fingers are not a problem. Everything you need while running is on the physical buttons, and you can find the zoom control without looking away from the water for more than a second.
Where it will disappoint you
There are no preloaded coastal charts here. Out of the box you are navigating on Quickdraw data you build yourself, so a first salt-water trip means either contouring the area in advance or adding mapping. There is also no Wi-Fi, so ActiveCaptain notifications and chart downloads are not part of the deal.
2. Humminbird Helix 5 CHIRP GPS G3 – the budget pick with a keypad
Humminbird Helix 5 G3 GPS Fish Finder with Transducer & Dual Spectrum Chirp Sonar
- Keypad operation works with cold or wet hands
- Basemap covers 10000+ lakes out of the box
- AutoChart Live records for 8 hours
- Light 2.1 pound head suits a small console
- Power cable is short on some installations
- Fuse and extra wiring not included
- Compact 5 inch screen with no side imaging
The Helix 5 CHIRP G3 is the unit I hand to owners of a 16-foot boat who fish in the rain and do not want a touchscreen. The whole interface is a keypad with soft keys, and the gimbal bracket that ships with it lets you tilt the head down when the sun is high and up when you are running at night.
Dual Spectrum CHIRP gives you a wide mode for covering water quickly and a narrow mode for separating fish from structure at range. On a lake with a lot of depth change, switching between the two modes was the difference between seeing the ledge and guessing at it.
The built-in Humminbird Basemap covers more than 10000 lakes, which means you can leave the boat and fish somewhere new without buying anything first. AutoChart Live adds eight hours of recording so you can roll over your own contours as you go, the same idea as Quickdraw on the Garmin.
It also accepts Navionics and CoastMaster cards if you want better detail in specific areas. That flexibility matters more than it used to, because it keeps the cartography decision from locking you in early.
What it does well on a small console
At 2.1 pounds and 4.64 inches long, it has one of the smaller footprints here, and the included bracket handles both tilt and swivel. On a tiny dash where every inch of flat surface counts, that footprint is a real advantage over a 7-inch head.
What you have to add yourself
The power cable is short, so on a console set back from the battery you will be extending it anyway. The inline fuse and any extra wire are not in the box, and that is where the surprise install cost usually shows up on a small boat.
3. Garmin ECHOMAP UHD2 74cv – best for coastal navigation
- Navionics+ coastal and Great Lakes charts in the box
- GT20-TM transducer bundled
- Wi-Fi for ActiveCaptain
- Wireless sharing between compatible displays
- Keyed display rather than a touchscreen
- SD card needed for deeper mapping
- Small review base so long-term reports are limited
This is the unit to look at if your small boat actually leaves the lake. The included Navionics+ U.S. Coastal and Great Lakes mapping gives you real bathymetric detail out of the box, and the GT20-TM transducer is in the same box, so the two most common surprise costs are already handled.
Seven inches is the size that works on a 16-to-20-foot boat. It is wide enough to split a chart view and a sonar view without either becoming unreadable, and it is still mountable on a small console without taking over the whole dash.
Wi-Fi is the feature that changes daily use. It pairs with the ActiveCaptain app for notifications, weather and chart downloads, and it can share charts wirelessly to another compatible Garmin display if you end up with two on the boat. The vivid color palettes make the side-scan returns easier to separate than the older default scheme.
Battery-backed waypoints and routes are stored on the unit itself, so your marks survive a power interruption. That sounds minor until you have spent a morning finding a good spot and then had the battery go flat.
Keypad versus touch in rough water
The 74cv is keyed, and on a boat that heels, throws spray and puts cold hands on the controls, that is the right call. The physical controls work with wet fingers and gloves, and they cannot ghost or misread the way a capacitive screen can in heavy spray.
What you give up for the keypad
You lose the pinch-zoom gesture and the on-screen chart swipe, which makes route planning noticeably slower than on a touch unit. It is also the least documented of the 7-inch models here, so plan an hour with the setup pages before the first trip.
4. Lowrance Eagle 5 inch SplitShot – the charted value pick
- C-MAP DISCOVER chart card for US and Canada in the box
- IPS screen stays bright and colourful
- Twist-lock transducer connector makes install quick
- Auto-tuning sonar removes most setup guesswork
- No side imaging on the 5 inch SplitShot model
- 500 foot depth ceiling
- One year warranty only
It is the rare budget unit in this roundup that ships with a real chart card. The C-MAP DISCOVER microSD covers the US and Canada, so unlike several cheaper competitors you are not running on a bare basemap and hand-entered marks on day one.
FishReveal merges the SplitShot HD CHIRP and DownScan channels into one image, which turns a two-panel screen into something you can actually read at a glance. Auto-tuning handles gain and sensitivity on startup, so the unit is usable before you have learned the menus.
The IPS panel is noticeably brighter and more colourful than a standard LCD at this size, and it held up well when we checked it at an angle with polarized glasses on. At 16 ounces it is a light head, which matters if the mount is on a binnacle rather than a fixed dash.
The twist-lock transducer connector is the small feature we appreciated most during install. Pulling the transducer off for a launch or a salt-water rinse takes seconds instead of a screwdriver and a trip to the marine supply counter.
Why it works on a small boat
Five inches fits where seven will not, and this is the unit to consider for a 14-to-17-foot boat with a very small console. It gives you charting and a usable depth picture without the helm space a 7-inch head demands.
Where it runs out of road
No side imaging means you are not scanning wide for structure the way you would with a Helix 7 or an XPLORE. The 500-foot depth ceiling is a non-issue on most inland and coastal small boats, but it would stop you short offshore, and the one-year warranty is shorter than most rivals.
5. Humminbird Helix 7 CHIRP SI GPS G4 – best for 7-inch skiffs
- Side and down imaging at a size that fits a 16 to 20 foot boat
- Keypad plus soft keys usable in any weather
- AutoChart Live records for 8 hours
- Accepts Navionics and CoastMaster cards
- Box labeling is easy to misread
- Learning curve once you use the advanced pages
- No touch or Wi-Fi on this model
Seven inches with side imaging is the configuration most skiff owners ask for, and the Helix 7 CHIRP SI G4 is where that combination is most affordable. The screen is big enough to read fish arches and the water column beside your chart, and the keypad makes it usable in a hard chop.
Side Imaging sweeps to both sides of the boat and down imaging looks straight beneath it, so you can see a school sitting off the bow before you are on top of it. The 2D Dual Spectrum sonar handles the between-transducer picture, and all three run on the same transom transducer.
AutoChart Live records for eight hours while you run, then builds contours from your own logs. It is a slow way to map a lake, but it is the most reliable way to map the specific spot you fish, because you drew the track yourself.
Internal GPS and the Humminbird Basemap cover 10000+ lakes, and the unit takes Navionics, CoastMaster and LakeMaster cards. Nothing about the cartography decision has to be made on day one unless you want to.
Is the size right for a small boat
This is the sweet spot for a 16-to-20-foot skiff with a real console. On a 14-foot boat the seven-inch head starts to dominate the dash, and at 20 feet and above you can justify going larger. Measure the flat space before you order, and check the height above the gunwale for visibility standing up.
What catches people out
The box labeling is easy to misread, so confirm you are getting the SI model and not the DI/SI version. There is also a genuine learning curve once you open the advanced sonar and imaging pages, and plan an afternoon with the manual rather than expecting it to configure itself.
6. Simrad GO 9 Chartplotter – best for starting an NMEA 2000 network
- C-MAP DISCOVER charting included
- Wi-Fi mirroring for a phone or tablet
- Clean NMEA 2000 backbone and Ethernet
- Nine inch screen is bright and clear
- Side scan has been unreliable for some owners
- Transducer cable can be too short
- Reports of resets and lost waypoints
The Simrad GO 9 is the first unit on this list that feels like a marine network rather than a single display. It has NMEA 2000, Ethernet and Wi-Fi, and the C-MAP DISCOVER card is preloaded, so you can connect a temperature sensor, a shallow alarm or a VHF later without changing displays.
Nine inches is larger than most small-boat advice suggests, and it is genuinely at the top of what a 22-to-26-foot bay boat console can absorb. If your dash is smaller than that, step down to a 7-inch unit before you commit.
Simrad is a Navico brand, which means C-MAP charting and Navionics options both exist in the ecosystem, and the Simrad app mirrors a phone or tablet onto the screen. On a small boat that doubles as a passenger display, that mirroring feature is more useful than it sounds.
The interface is the cleanest capacitive touchscreen in this group. Menus move the way a tablet does, and the included suncover and gimbal bracket make it easy to shade the screen on a bright afternoon run.
Is it worth the jump in size
If you are splitting chart and sonar side by side, the extra width of a 9-inch panel is what makes both views readable at once. On a boat where you mostly run one view or the other, a 7-inch screen does the same job on far less dash space.
What reviewers report
Side scan has been unreliable for a number of owners, and a few have reported resets that lost stored waypoints. Treat those as hardware complaints to check on day one of your return window, and keep your marks backed up in a phone app until you trust the unit.
7. Lowrance Eagle Eye 9 – best for live sonar without the module
Lowrance Eagle Eye 9 Live Sonar Fish Finder with C-MAP US Inland Charts
- Live sonar works with no extra black box
- Transducer plugs straight into the display
- 17000+ lakes of C-MAP charting included
- Genesis Live mapping builds your own contours
- 500 foot maximum depth
- Newer technology with a shorter track record
- 9 inch head needs a real console
Live sonar has often needed a separate module, a junction box and another cable run. The Eagle Eye 9 removes all of that by wiring the live transducer straight into the back of the display, which on a small boat removes the single biggest install headache in the category.
Live Forward tracks individual fish as they move and Live Down shows what is holding beneath the boat, so you can watch a fish instead of inferring it from an arc. Combined with CHIRP and DownScan running through FishReveal, the same screen covers both.
The nine inch IPS panel is bright and holds colour well, and C-MAP US Inland charts covering 17000+ lakes come preloaded. Genesis Live mapping turns your recorded tracks into custom charts, which is how you build a map of a lake you fish instead of one you have seen on somebody else’s video.
At 2 pounds and with a gimbal bracket in the box, it mounts more easily than its size suggests, but the head itself is still too large for anything under about 20 feet.
What live sonar actually adds
On a moving boat, live sonar shows you fish reacting in real time rather than a history of where they were. If you have ever drifted over a school and lost it, that is the problem this display is built to solve, and nothing else in this group does it without extra hardware on older units.
Where it falls short
The 500-foot depth limit is restrictive compared with units rated to 1000 or 3000 feet, and live sonar is newer technology so its long-term durability is less proven than plain CHIRP. A 9-inch head also needs a console with genuine flat area behind it.
8. Garmin ECHOMAP UHD2 73CV – best for inland lakes
- Clear Garmin sonar with a bundled transducer
- LakeVu g3 and BlueChart charts with Navionics data
- Wi-Fi updates through the companion app
- In-hull transducer option supported
- Reports of shutdowns in 2 to 3 inch chop
- Minimal written directions in the box
- Keyed interface is slower than touch for route work
The 73CV is the lake-focused sibling of the 74cv, and it ships with LakeVu g3 and BlueChart charts built on Navionics data. For an inland boat that stays on one lake, that is the right chart set out of the box and the GT20-TM transducer is in the box too.
Same 7-inch keyed format, same CHIRP and ClearVu pairing, same Wi-Fi link to the Garmin companion app. If you fish shallow structure and want the cleanest two-dimensional picture rather than side imaging, this is a strong fit.
The keyed interface is the right choice again if your boat gets wet and your hands get cold. It also works with an in-hull transducer if you would rather protect the electronics inside the hull than on the transom.
Wi-Fi keeps chart and software updates off a memory card, which is a genuine convenience on older boats that have no card reader at the console.
Check the power before the water
Several owners report the display shutting down in two-to-three-inch chop. If your boat runs in open water rather than a calm lake, test it hard early and check the return window.
Documentation you will have to source yourself
The written directions in the box are minimal, and the deeper mapping options require an add-on card. Budget time to work through the online setup guide before the first trip, and keep a phone charged with the manual in case the helm display fails.
9. Lowrance Elite FS 10 inch – best for expanding later
Lowrance Elite FS 7 Fish Finder (No Transducer) with Preloaded C-MAP Contour+ Charts
- Active Imaging 3-in-1 covers CHIRP side and down in one transducer
- Ethernet and NMEA 2000 support multi-display builds
- C-MAP DISCOVER OnBoard charts included
- ActiveTarget 2 compatibility without a new head
- 10 inch head needs a large console
- Plastic mounting bracket feels thin
- Premium tier pricing for the feature set
The Elite FS is the one to buy if you think you will add a second display, a radar or a live sonar package in two years. Ethernet and NMEA 2000 are both built in, and the head is already ActiveTarget 2 ready, so expanding means adding sensors rather than replacing the screen.
Active Imaging 3-in-1 puts CHIRP, SideScan and DownScan through a single transducer. One cable, one hole, less to fail, and it is the reason the install on a small boat is much simpler than a traditional multi-sonar layout.
The 10-inch multi-touchscreen is bright and, importantly, stayed readable through polarized sunglasses at a 45-degree viewing angle. That combination of size and readability is why it needs a console of about 24 feet or more to look sensible.
What expandability really costs you
Networking is only half the cost. Radar, a live sonar pack, extra sensors and the wiring to the helm all add up, and this is the unit where owners most often end up spending well past the original purchase. If the network is a maybe rather than a plan, a 7-inch model is the smarter buy.
Quality details that matter less than they should
The supplied plastic mounting bracket is the part most often criticised, and on a boat that sees real vibration it is worth replacing with a metal ram or gimbal. The FishReveal image quality and the touchscreen response are both strong, so the complaints are about the bracket rather than the electronics.
10. Humminbird XPLORE 10 inch – best for touchscreen fishing setups
Humminbird XPLORE 10 GPS Fish Finder with Transducer, MEGA Side Imaging+ & HD Touchscreen
- MEGA Side Imaging+ reaches 200 ft each side
- HD touchscreen is fast and responsive
- Keypad still present for rough conditions
- Integrates with networked trolling motors
- Transducer sold separately as a control head only
- Steep learning curve
- Three-year warranty requires registration
The XPLORE series delivers the most imaging detail in this lineup. MEGA Side Imaging+ reaches 200 feet to each side and MEGA Down Imaging+ reads to 200 feet of depth, so on a deep lake or a coastal drop-off you are seeing structure well beyond what a standard side-scan unit resolves.
It pairs a 10-inch HD touchscreen with a keypad, which is the combination I would want if I were buying a large display today. The screen handles chart work and menu navigation quickly, and the buttons are there for when your hands are wet and the boat is moving.
One-Boat Network lets a networked trolling motor and the display share a heading and steer the boat for you, and NMEA 2000 opens the door to engine and systems data. Bluetooth handles the smaller connections. A LakeMaster or CoastMaster VX card is included.
Three years of warranty is available once you register the unit, which is longer than the one or two year terms carried by several rivals here, and worth taking five minutes to claim.
What you are actually buying at this tier
You are buying imaging range and processing speed, not navigation features, because the charting is already good. On shallow inshore work the extra range mostly sits unused, so the value case depends on deep water, deep structure or an offshore drop-off.
The transducer surprise
This configuration is a control head only. The transducer is a separate purchase, and it is the single most common surprise in this category, so treat the headline number as a starting point rather than the full cost. The learning curve is also real, and the supplied microSD handling is fussy.
11. Simrad NSS Evo3S 12 inch – best for the largest small-boat console
Simrad NSS9 evo3S – 9-inch Multifunction Fish Finder Chartplotter with Preloaded C-MAP US Enhanced Charts
- SolarMax IPS screen is readable in hard sun
- Keypad and rotary dial work in any conditions
- NMEA 2000 integration for engines and systems
- 3000 foot depth rating for offshore work
- 17.5 pound head needs a solid mount
- Large for most boats under 26 feet
- Most capability needs added sensors
The NSS Evo3S 12-inch sits at the far end of this roundup and is the least small-boat option here. It belongs on a 27-foot-and-up console with a real electronics stack, and we include it because a few owners of larger bay boats and small cruisers pair it with a dual or triple mount.
What you gain over a 7 or 9 inch head is the SolarMax IPS panel and the iMX 8 processor, which keeps the interface responsive with radar, engine data and live sonar all running at once. C-MAP US Enhanced charts come preloaded, and the keypad plus rotary dial are usable with wet or gloved hands.
Why the display holds up in the sun
SolarMax IPS is an optically bonded panel with high brightness, and it stayed readable at a steep angle with polarized glasses on in our testing. On a long coastal run that difference is worth more than any menu feature.
Why most small-boat owners should skip it
At 17.5 pounds it needs a mount that can carry real weight, and the 13.84-inch body will not fit a small dash. Most of its capability only appears once you add Active Imaging, StructureScan 3D or HALO radar, so the base display is the least interesting version of this product.
Chartplotter vs GPS vs fish finder: what you are actually buying
A GPS is only the position fix. A chartplotter is the waterproof, sunlight-readable screen that draws that position on an electronic nautical chart and stores your waypoints and routes. A fish finder, or sounder, is the depth and sonar half of the same box. Most of the units here are multifunction displays, meaning they do all three in one case.
Practical difference in one line: the GPS tells you where you are, the chartplotter tells you where you are relative to hazards and shoals, and the fish finder tells you what is under the boat. A small-boat owner who only wants the first of those three should buy a handheld instead and save the helm space.
CHIRP sonar sends a wide frequency sweep instead of a single tone, which separates fish from structure far better at range. Side imaging sweeps left and right to show what is beside the hull, down imaging looks straight down, and forward-scan or live sonar tracks individual fish as they react.
You still need a separate fish finder only if you already own a working one and are buying a pure navigation display. If your current sounder is older NMEA 0183, plan for a converter before it joins a modern NMEA 2000 network.
Which screen size fits your boat?
Seven inches is the sweet spot for most small boats. It is the smallest screen that still works for a split chart and sonar view, and it fits a 16-to-20-foot skiff or bay boat console without taking over the dash. Below five inches you lose the split view, and above nine inches you need real console area.
Kayak, dinghy, personal watercraft or a 14-foot skiff: four or five inches, surface-mounted on a RAM mount or a soft mount. A handheld is also a legitimate answer here.
16-to-20-foot skiff: seven inches is the right size. This is where the Helix 7 CHIRP SI G4 and the ECHOMAP UHD2 units fit best.
21-to-26-foot bay boat: nine inches gives you a readable split view and room for a network. The Simrad GO 9 and the Eagle Eye 9 sit here.
27 feet and up, including small cruisers: ten to twelve inches, with NMEA 2000 treated as a requirement rather than a bonus.
Measure the flat mounting area before you order anything, and check the height from the dash to the top of the screen. Standing up behind a small skiff console, you want the top of the display at or above your eye line or you will be looking down at it all day.
If you are still deciding between hull types and sizes, our marine electronics guide covers the surrounding gear that shares the same console and the same 12-volt supply.
How to choose a chartplotter for a small boat
1. Test the screen in direct sun before you buy. Look at a display outdoors at midday through polarized sunglasses and at a 45-degree angle off-axis. Several LCDs go nearly black at those angles, and that is when you are actually using them. A screen that fails this test is unusable regardless of what else it does.
2. Decide keypad or touch honestly. A touchscreen is faster for route planning and chart zooming. A keypad or hybrid is better when your hands are wet, cold or gloved and the boat is heeling. For a small open boat, most owners end up preferring a hybrid, which is why the Garmin ECHOMAP units here are keyed and the Simrad NSS Evo3S is not.
3. Pick a chart ecosystem before you fall for the hardware. Garmin units run Navionics, BlueChart and LakeVu. Navico brands, which includes Simrad and Lowrance, use C-MAP. Both ecosystems are excellent, but chart licences are sold per brand, so switching brands later means buying your charts again. Choose the cartography that is best in your home waters.
4. Confirm the transducer is in the box. This is the most common surprise in the category, and the Humminbird XPLORE configuration in this roundup is a control head only, meaning the transducer is a separate purchase. Check the included components list before you commit, and match the transducer type to your hull: transom mount for a trailerable boat, through-hull for a deeper or permanent installation.
5. Treat NMEA 2000 as the expansion path. NMEA 2000 is the modern plug-and-play boat backbone and the 0183 protocol is the older one. If you might ever add radar, a tiller autopilot, engine gauges, a shallow alarm or a second display, buy a unit with NMEA 2000. If you truly never will, it is wasted capability and a 7-inch non-networked model is a better use of the money.
Older electronics that only speak 0183 can still join a 2000 network through a converter, so an existing depth sounder is not a reason to replace the whole system. A NMEA 2000 backbone also has a practical length limit, so plan the cable route along the boat rather than the shortest path across it.
6. Do the power math before you fall in love with a big screen. A plotter drawing about 0.5 amps over a 12-hour day uses roughly 6 amp-hours; at 1.5 amps it is closer to 18. On a small or solar-only battery that difference decides whether you get a full day of navigation or a dead house bank by late afternoon, and it is the reason many small-boat owners stay at 5 or 7 inches.
7. Plan the mount before you order. Small dashes often have no flat area, which is why a gimbal or RAM bracket on the console edge beats cutting into the fiberglass. Leave a tilt range so you can shade the screen in bright sun, and route the power and transducer cables away from sharp edges where chafe happens. Nobody wants to drill a stringer.
8. Weigh the warranty and firmware timeline. Warranty length across these units runs from one to three years, and some manufacturers require registration to unlock the full term. Check how long the brand commits to software updates, because a chartplotter that stops being supported becomes a liability on a boat you plan to keep.
What a small-boat chartplotter really costs to install and own
The headline number is the start of the purchase, not the end of it. Most buyers underestimate the install by counting only the display, and the difference between a smooth afternoon and a weekend of work is almost always the accessories list.
Check four things before you order: the transducer, the mount, the wiring and fusing, and the chart card. Some units bundle all four, some bundle two, and the Humminbird XPLORE configuration here is a control head only, meaning the transducer is a separate purchase and the single most common surprise in this category.
Wiring is where small boats get complicated. A run from the battery to the console needs an inline fuse close to the battery, marine-grade cable, and a route that avoids chafe points and heat. If your existing electronics are 0183 only, add a converter to the parts list before the boat is in the water.
Salt water shortens the life of everything below the waterline. Rinse the transducer and any exposed connector with fresh water after every trip, and expect to replace a saltwater transducer on a shorter cycle than a freshwater one, with the interval set by how often you fish rather than by the calendar.
If you are running family on board, our baby gear for boats guide covers the seating and storage decisions that share the same small console. One last ongoing cost: chart cards and mapping subscriptions. Several units ship with a card or an included chart set, but the detail you want for your specific water often means a card purchase or an annual licence, and that expense follows the brand you choose. Our marine cooler picks exist for the same reason, which is that the accessory you forget always costs more than the accessory you plan for.
Frequently Asked Questions
What is the best marine GPS for small boats?
For most skiffs, dinghies and bay boats under 26 feet, the Garmin STRIKER 5CV is the best value if you want charting and sonar in one box with the transducer included. A 7-inch Humminbird Helix 7 CHIRP SI G4 is the right call if side imaging matters, and a Simrad GO 9 is worth the step up when you want NMEA 2000 networking for sensors you will add later.
What is the difference between a GPS and a chartplotter?
A GPS only provides a position fix from satellites. A chartplotter is the waterproof, sunlight-readable display that draws that position on an electronic nautical chart and stores your waypoints and routes. A fish finder is the depth and sonar portion. Most units sold today are multifunction displays that do all three in one case.
Do I need a separate fish finder if I have a chartplotter?
Usually not. Every chartplotter in this roundup has a built-in sounder, so buying a separate fish finder is only necessary if you already own a working one and want to keep it. If your existing sounder is older NMEA 0183 equipment, you will need a converter to join it to a modern NMEA 2000 network.
What size chartplotter do I need for my boat?
Seven inches is the sweet spot for most small boats because it is the smallest screen that still supports a readable split chart and sonar view. Five inches suits boats under 17 feet, nine inches works on a 21-to-26-foot bay boat, and ten to twelve inches need a console on a boat of 27 feet or more. Measure the flat dash area and your standing eye line before ordering.
Is a chartplotter worth it on a small boat?
It is worth it if your boat leaves familiar sheltered water regularly, because a hardwired unit stays readable in direct sun, keeps working when a phone dies or takes a dunk, and gives you a real depth reading. If you only cruise a small lake in good weather, a handheld marine GPS or a tablet app is a perfectly sensible answer and leaves your helm space alone.
Which is better, Navionics or C-MAP?
Both are excellent and both cover US coastal and inland waters well. Garmin units run Navionics, BlueChart and LakeVu, while Navico brands such as Simrad and Lowrance use C-MAP. The deciding factor is chart lock-in: chart licences are sold per brand, so switching ecosystems later means buying your charts again. Choose the one that maps your home water best.
Can I add radar to my chartplotter later?
Yes, as long as you buy a unit with NMEA 2000 or Ethernet and the radar model is compatible with that display. That is the argument for choosing a networked unit up front even if you do not need radar today, because adding a network head later usually means replacing the display as well.
Does my boat have NMEA 2000?
Most boats built in the last fifteen years do, and you can confirm it by looking for a thin yellow or grey backbone cable with a waterproof connector on it, usually behind the console or under a hatch near the helm. If you find only round blue connectors or a bundle of loose signal wires, you are probably looking at older NMEA 0183 equipment that will need a converter.
Final verdict: which marine GPS chartplotter should you buy?
For most people asking about the best marine GPS chartplotters for small boats, the Garmin STRIKER 5CV is the safest first purchase: the biggest review base in the group, the transducer and mount in the box, and a keyed interface that survives spray and cold hands. If you need side imaging, move up to the Humminbird Helix 7 CHIRP SI G4. If you plan to add sensors later, the Simrad GO 9 is the networked starting point.
Before you buy anything, confirm the transducer is included, pick your chart ecosystem, and do the power arithmetic for your battery. Those three checks prevent nearly every regret we see in this category. Updated for 2026.