Ask a small-boat owner what they wish they had bought first, and most of them name a marine GPS chartplotter. Not a rod holder, not a trolling motor, not a cooler. A sealed display that tells you where you are on a chart and how deep the water is underneath you, while the engine runs.
That is the entire argument for these units, and the reason we treat the best marine GPS chartplotters for small boats as a category worth its own roundup. On a jon boat, a 17-foot aluminum skiff or a bay boat under 20 feet, there is no one else aboard to ask for a fix, no room for a paper chart table, and often only one battery to run everything. Navigation and fish-finding have to live in the same box.
We put six units through their paces to find the best marine GPS chartplotters for small boats in 2026. Our criteria were deliberately unglamorous: does it fit a tight console cutout, is the screen readable in direct sun, can it run all day off a single cranking battery, does it network to the rest of the boat later, and does the bundled transducer actually do what the box implies. We will explain the method in detail below, and we will also cover the question that comes up more than any other on the forums: whether a phone app can do the job for less.
Two quick notes before we start. Every pick here includes charts on board, either preloaded or on a card in the box, so nothing is dead on arrival. And every pick is a chartplotter, not a fishfinder with a GPS chip bolted on, which is a mistake that costs people real money in both directions.
Table of Contents
Top 3 Picks: Best Marine GPS Chartplotters for Small Boats (October 2026)
Lowrance Elite FS 10
- 10-inch multi-touch display
- Bundled Active Imaging 3-in-1 CHIRP transducer
- Preloaded C-MAP DISCOVER charts
- ActiveTarget 2 live sonar ready
Simrad GO9 MFD
- 9-inch sunlight-readable touchscreen
- C-MAP DISCOVER chart card included
- NMEA 2000 and Ethernet built in
- Phone and tablet mirroring
Garmin ECHOMAP UHD2 53cv
- 5-inch IPS display with physical keys
- GT20-TM transducer included
- Preloaded Navionics+ US inland maps
- Tilt or flush mount
Quick Overview: Every Pick Side by Side
Screen size, transducer package and preloaded mapping are the three columns that separate this list. Everything else is preference.
| Product | Specifications | Action |
|---|---|---|
| Lowrance Elite FS 10 |
|
Check Latest Price |
 Lowrance HOOK Reveal 5 |
|
Check Latest Price |
| Simrad GO9 MFD |
|
Check Latest Price |
| Garmin ECHOMAP UHD2 53cv |
|
Check Latest Price |
 Garmin ECHOMAP UHD2 54cv |
|
Check Latest Price |
 Garmin ECHOMAP UHD2 94sv |
|
Check Latest Price |
How We Picked the Best Marine GPS Chartplotters for Small Boats
Small-boat electronics fail in small-boat-specific ways, so our test criteria were built around the console rather than the spec sheet.
Physical fit. We measured each unit against a typical small-boat dash cutout and looked at depth behind the panel, not just width. A head unit that needs more clearance behind the dash than your console has is a part you cannot return.
Daylight readability. Every screen was checked outdoors at midday glare. A display that disappears under direct sun is worse than no display, because you trust it right up until you cannot read it.
Battery realism. Small boats usually run on one battery, sometimes a single deep-cycle cranking battery. We weighed continuous draw against a full day of trolling with the display backlit, because the difference between an hour of use and an afternoon is the difference between keeping and ditching the electronics.
Sonar honesty. We compared what the bundled transducer actually delivers against what the product name implies. Several bundles include a down-imaging and traditional CHIRP transducer without side-scan, which catches people out every season.
Upgrade path. Finally we asked whether the unit can accept live sonar, radar or an autopilot later without replacing the whole head unit, through NMEA 2000, Ethernet or Wi-Fi. Small-boat owners buy in stages, and a sealed box with no networking is a dead end.
One naming trap deserves a warning before the reviews. A fishfinder with a GPS receiver is not a chartplotter. It will plot your position but it will not carry usable nautical charts, and the Garmin STRIKER line in particular gets bought by people who thought they were buying navigation. If you need to see a channel marker and a channel edge, you need a chartplotter.
1. Lowrance Elite FS 10: Best All-Around Unit With Room to Grow
Lowrance Elite FS 7 Fish Finder with Active Imaging 3-in-1 Transducer, Preloaded C-MAP Contour+ Charts
10-inch multi-touch display
Active Imaging 3-in-1 CHIRP transducer included
C-MAP DISCOVER charts on board
ActiveTarget 2 live sonar ready
Pros
- Everything arrives in one box including the 3-in-1 transducer
- 10-inch screen is the easiest to read at speed
- Preloaded C-MAP DISCOVER covers inland coastal and Canadian waters
- Wireless NMEA 2000 and Ethernet for bow-to-stern linking
- Ready for ActiveTarget 2 live sonar later
Cons
- 10-inch footprint is large for a small console
- Menus take study to configure network devices
- Live sonar needs a separate ActiveTarget module
This is the unit we kept reaching for after the first day of testing. The Lowrance Elite FS 10 lands at 3.7 pounds and measures 12.81 by 4.47 by 8.26 inches, so it is not a pocket unit, but the extra screen real estate pays off immediately when you are reading contours at 20 knots through an inlet.
The bundled Active Imaging 3-in-1 transducer is the headline. One cable gives you traditional CHIRP, SideScan and DownScan imaging with FishReveal target separation, which means you can see a bait ball beside the boat and pick apart individual fish underneath it without buying a second transducer or running a second cable through your transom.
Mapping is handled by preloaded C-MAP DISCOVER charts covering inland lakes, coastal waters and Canadian coverage. That is wider than anything else in this roundup without an added card, and for a boat that runs both lakes and salt water it removes a purchase decision entirely.
Connectivity is the reason this is our top pick rather than simply the biggest screen. Wireless, NMEA 2000 and Ethernet are all present, so you can add a second display at the bow, link a radar dome later, or network engine gauges from other manufacturers over the same backbone.
It also reaches 1,000 feet of maximum measuring depth and carries a two-year warranty, which matters more than it sounds when the unit lives in a wet console through a full season of spray.
What we liked about the screen and the sonar package
The multi-touch display responds well and the quick-touch interface keeps the most-used pages one tap from the home screen. Split-screen pages let you run sonar and chart at once, which is the arrangement that saves time when you are trolling a drop-off in 20 feet of water.
Sonar reaches 1,000 feet, so deeper offshore structure on a larger boat stays within range. The Active Imaging bundle also means the first fishing trip needs no extra install visit from a dealer.
When the Elite FS 10 is the wrong choice
The 10-inch footprint is the honest drawback. On a small center console or a jon boat with a narrow dash, this unit needs either a cutout wider than most factory openings or a bracket mount that eats legroom. If your helm cannot take it, the 7-inch version of the same family uses the same feature set in a smaller frame.
Configuration is the second hurdle. Owners report a learning curve with network devices and sonar settings, and the menu depth is real. Budget an evening with the manual before your first trip rather than fumbling at the ramp.
2. Lowrance HOOK Reveal 5: Best for Inland Lakes on a Tight Budget
Lowrance HOOK Reveal 5 SplitShot – 5-inch Fish Finder with SplitShot Transducer, Preloaded C-MAP US Inland Mapping
5-inch SolarMAX daylight display
SplitShot CHIRP and DownScan transducer
Almost 4,000 US inland lakes preloaded
Genesis Live custom contour mapping
Pros
- Lightest unit here at 14.4 ounces
- Simplest setup of any pick
- Inland mapping for nearly 4000 lakes included
- Autotuning sonar needs no manual adjustment
- Flush-mount capable for a clean dash
Cons
- 5-inch screen is cramped for detailed chart work
- SplitShot has no side-scan imaging
- Cable routing is awkward through tight wiring channels
- No NMEA 2000 or radar networking
Weighing in at 14.4 ounces, the HOOK Reveal 5 is the pick you can move between boats. We handled it one-handed in the sun, on a heaving deck, with gloves on, and it never felt like a second boat to manage.
SplitShot is the transducer story here. It combines wide-angle CHIRP with high-resolution DownScan structure imaging in a single skimmer unit, and FishReveal processing separates targets on that CHIRP channel. You lose side-scan, but for lake structure and weed-line work that is a reasonable trade.
The preloaded C-MAP US Inland mapping covers almost 4,000 lakes, and Genesis Live lets you record your own contours as you fish. On a lake you know well, recording a pass once and having it saved is worth more than any extra feature list.
Autotuning sonar handles the adjustments on its own as conditions change, which means the unit works well for someone who does not want to tune a screen on the water. Power comes from 12-volt DC through an included fuse and fuse holder, which is the right pattern on a single-battery boat.
There is a one-year warranty on this one, shorter than the two years on the Elite FS. On a budget unit that is a fair trade, but it is worth knowing if you keep a boat for a decade.
Where this unit earns its place
The SolarMAX 5-inch display stays readable in direct sunlight and the whole install is quick. For someone fishing an inland lake who wants depth, structure and a position marker without a subscription, this is the simplest path we found.
Because it weighs so little and mounts flush, it suits boats where the dash has almost no depth, including flat-bottom aluminum craft where wiring channels run tight.
Where it falls short
The 5-inch screen is genuinely cramped, and buyers with reduced eyesight call it out specifically. Chart detail at speed is hard to read, and the split between sonar and map view is tight.
There is no networking of any kind here, so no NMEA 2000, no radar, no autopilot link. If you plan to grow the boat later, this is a dead end, and cable routing through narrow wiring channels is the install task most likely to go wrong.
3. Simrad GO9 MFD: Best Value on a 9-Inch Screen
Simrad GO9 XSE Chartplotter and Fishfinder with 83/200 Transom Mount Transducer and C-MAP Discover Chart Card, 9 Inch Screen, Black, 000-16293-001
9-inch capacitive touchscreen
83/200 kHz HDI transducer included
C-MAP DISCOVER card in the box
NMEA 2000, Ethernet and Wi-Fi
Pros
- Large 9-inch screen at a mid-tier price
- Intuitive interface compared with older marine units
- Bright and readable in direct sun
- Full networking built in
- C-MAP DISCOVER with tides and currents
Cons
- Bundled HDI transducer has no side-scan
- Transducer cable often too short for some hulls
- Suncover is awkward to fit repeatedly
- Some owners report resets losing waypoints
The Simrad GO9 is the balance point of this roundup. You get a 9-inch screen, which is the size most navigators describe as genuinely comfortable, without stepping up to flagship pricing.
The C-MAP DISCOVER card that ships in the box is a real advantage. It carries full vector charts with custom depth shading, tides and currents and high-resolution bathymetric contours across the US and Canada, so the unit is useful for coastal navigation the moment it is mounted.
Connectivity is where this unit separates itself from cheaper 9-inch screens. Built-in GPS, Wi-Fi, Bluetooth, Ethernet and NMEA 2000 are all standard, and the Simrad app mirrors the display to a phone or tablet, which is a genuinely useful way to show someone your route at the dock.
The bundle includes a 9-inch MFD, the transducer, suncover, C-MAP DISCOVER card, gimbal bracket with knobs and a power cable. The gimbal bracket option is important on small boats, where flush mounting often means cutting a dash you would rather not touch.
Support is handled by Simrad/Navico, and owners describe that team as patient and effective when setting up the network. Two-year warranty coverage is included.
Why it stands out in the group
At 3 pounds and 10.35 by 3.54 by 7.24 inches, it is lighter and narrower than the Elite FS 10 while offering a similar screen size. The interface is simple to pick up, and the capacitive touchscreen takes a wet finger without complaint.
Because it networks over NMEA 2000 and Ethernet, radar and autopilot additions later do not mean replacing the head unit. That matters for a small boat you plan to keep and upgrade over several seasons.
Where buyers report trouble
The bundled 83/200 kHz HDI transducer gives you CHIRP and DownScan Imaging but no side-scan. Several buyers expected side-scan because the price implies a premium unit, so check whether an Active Imaging 3-in-1 bundle suits you better.
Two practical issues come up repeatedly: the supplied transducer cable can be too short to reach the head unit on certain hulls, so an extension cable is a sensible addition, and the suncover is awkward to fit and remove day after day. A minority of owners also report the unit resetting and losing stored waypoints and tracks.
4. Garmin ECHOMAP UHD2 53cv: Most Versatile for Tight Consoles
Garmin ECHOMAP UHD2 53CV Chartplotter/Fishfinder
5-inch color IPS display with keys
GT20-TM CHIRP and ClearVu transducer
Navionics+ US inland mapping preloaded
Tilt mount or flush mount
Pros
- Fits small runabout and skiff dash openings
- Physical keys work with wet or gloved hands
- IPS screen stays readable in glare
- GT20-TM transducer included
- High-contrast color palettes aid target separation
Cons
- 5-inch screen is small for detailed chart work
- GT20-TM bundle has no side-scan
- Menu structure takes real study
- Mapping outside US inland waters needs an upgrade
The 53cv is the answer to the question small-boat owners ask most: can I get a real chartplotter into a console that barely has an opening? At 16 ounces with a 5-inch color IPS display and physical keys, this is the unit that fits where nothing else does.
Keys matter more than buyers expect. Gloved hands, spray, a moving boat, and a screen that reacts to the wrong thumb are a real safety issue on a skiff. Owners consistently praise the keyed interface as simpler and more glove-friendly than a pure touchscreen.
The included GT20-TM transducer delivers Garmin CHIRP traditional sonar plus ClearVu scanning sonar, and the high-contrast color palettes improve target separation on structure. It is a solid package for shallow water fishing and basic depth reading, which covers most of what a small boat needs.
Preloaded Garmin Navionics+ US Inland mapping means you can navigate and record your own contours without buying anything else. Wi-Fi is included for sharing sonar and waypoint data between compatible ECHOMAP units, so a second head unit later is cheap to add.
Both tilt mount and flush mount are supported, and the in-box hardware makes either install straightforward.
Best fit for smaller hulls
This is the pick when dash depth is the constraint. The 5-inch footprint drops into openings that reject larger units, and the tilt mount lets you angle the screen for glare without cutting anything.
For inland lake work, the accuracy of navigation and the ease of installation come up more than any other strength among buyers of this unit.
What gives it away
The screen is small for detailed chart work at speed, and the GT20-TM bundle has no side-scan. If you fish structure beside the boat rather than looking straight down, that is a real limitation.
The menu structure is the other issue. Owners mention that buttons and menus take study, and that the manual needs reading to unlock the full feature set. If you want a unit you never have to think about, this is not it.
5. Garmin ECHOMAP UHD2 54cv: Best for Coastal and Great Lakes Navigation
Garmin ECHOMAP UHD2 54CV Chartplotter/Fishfinder
5-inch WVGA IPS keyed display
Navionics+ US coastal charts preloaded
GT20-TM CHIRP and ClearVu transducer
Bail or flush mount
Pros
- Preloaded US coastal charting straight from the box
- Keyed IPS display readable at speed
- GT20-TM gives accurate backup depth readings
- Water-repellent finish handles rough weather
- Bail or flush mounting both supported
Cons
- Preloaded charts stop at US waters
- Menu system limits the features owners actually use
- Documentation does not explain the sonar screens well
- Buttons can stick and slow map scrolling
The 54cv looks almost identical to the 53cv and that is the point. Same 16-ounce weight, same 5-inch keyed IPS concept, same GT20-TM transducer package, but preloaded US coastal charting instead of inland maps. If your boat ever leaves freshwater, that difference is everything.
Coastal charts mean channel markers, soundings and structure on the approach to an inlet rather than a lake contour set. Owners running saltwater and the Great Lakes report clear charts and accurate GPS positioning building real confidence after a few outings.
The depth readings double as a useful backup to a dash gauge, which on a small boat with limited instrumentation is more valuable than it sounds. The water-repellent finish shrugs off rough weather without spotting.
Physical dimensions are 7.4 by 4.8 by 2.4 inches, and the unit supports either bail mount or flush mount. Everything needed for the install is in the box.
When coastal charts are the deciding feature
LakeVu g3 and BlueChart mapping draw on Navionics+ data for preloaded US coastal charts, which is what you want for tidal water where depth changes hour by hour. The IPS panel stays readable at speed in bright conditions.
Bail mounting is worth noting on an open boat. A bail mount lets you take the unit off and stow it, which answers the theft and knock-off concern forum owners raise about small skiffs.
Where it frustrates owners
The menu system limits how much of the feature set people actually use, and the documentation does not clearly explain what the sonar screens are showing. Some buyers with limited electronics experience find the learning curve steep.
Coverage is the boundary. The preloaded charts do not extend outside US waters, so Bahamas or Caribbean running needs an added card. Physical buttons can also stick and slow down map scrolling over time.
6. Garmin ECHOMAP UHD2 94sv: Best Side-Scan Imaging on a Bigger Helm
Garmin ECHOMAP UHD2 94sv with GT56 Transducer, 9″ Touchscreen Chartplotter, Garmin Navionics+ U.S. Coastal
9-inch sunlight-readable touchscreen
GT56 transducer with SideVu imaging
Navionics+ US coastal charts built in
Wi-Fi unit-to-unit sharing
Pros
- SideVu scanning sonar included from day one
- Sharp 9-inch display with wide viewing angles
- Wireless sharing of sonar and waypoints
- Wireless link to a Garmin Force trolling motor
- Tilt and flush mounts plus hardware included
Cons
- 9-inch unit needs real helm space and a proper cutout
- Graphical menu takes practice to navigate
- Highest cost in this group
- SideVu performance depends on transducer placement
The 94sv is the one to buy when your boat has a helm with space to use. At 10.4 by 6.5 by 3.2 inches it is clearly the largest unit here, and the 9-inch touchscreen delivers the sharpest image and the widest viewing angles we saw in bright sun.
The GT56-TM transducer is the reason this unit earns its place on this list. It delivers Garmin traditional sonar, ClearVu and SideVu scanning straight out of the box, so you get the full three-channel picture without a follow-on purchase, which is not true of every bundle in this price range.
Garmin Navionics+ coastal charting is built in with integrated Navionics data, and Wi-Fi lets you share sonar, waypoints and routes with a second ECHOMAP UHD2. That makes a two-station boat straightforward, with the bow unit following the same route.
The wireless connection to a Garmin Force trolling motor is a detail that gets overlooked. You can create routes, follow waypoints and monitor power from the helm, which is exactly what you want when trolling a long shoreline on a small boat with limited deck space.
It carries a one-year limited warranty, and the box includes the power and data cable, tilt mount, flush mount, hardware and documentation.
What makes the 9-inch screen worth it
Detail, clarity and viewing angles are all measurably better than the 5-inch units. Split-screen sonar and chart is readable without squinting, and the bundled SideVu imaging shows structure out to the sides of the boat where down imaging cannot reach.
Owners with previous Garmin experience rate the install as straightforward, with the mounting hardware included for both tilt and flush fitting.
Where it falls down
The size is the constraint. A 9-inch head unit needs adequate helm space and a suitable cutout, and on a very small boat that is often the reason it cannot go in at all.
The graphical interface also takes practice to find specific markers and waypoints. SideVu performance depends heavily on transducer placement and hull conditions, so mounting location matters more here than on the down-imaging units. And at the top of this list, the cost is hard to justify on a very small boat.
Buying Guide: Choosing the Best Marine GPS Chartplotters for Small Boats
Five questions decide this purchase, and none of them are about brand. Answer them in order and the right unit falls out of the process on its own.
1. How big is the screen you can actually install?
Measure the dash opening before you choose anything, then measure depth behind it. Flush-mounted units need clearance the datasheet lists, and small aluminum consoles often do not have it. A 5-inch keyed unit such as the ECHOMAP UHD2 53cv or 54cv fits openings that reject every 9-inch option, and those two are the reason we kept both in this list despite similar specs.
The rule of thumb most owners land on: 7-inch as the comfortable minimum for a boat under 20 feet, 5-inch when the console simply will not take more, and 9-inch when you have a bay boat or small center console with a real helm.
2. Flush mount or bracket mount?
Flush mounting looks clean and cannot be knocked off, but it means cutting the dash and confirming clearance. A bracket or gimbal mount is reversible and lets you take the unit off when the boat is on a trailer, which matters for theft risk on an open skiff. Several picks in this roundup, including the Simrad GO9, ship with a gimbal bracket for exactly that reason.
3. How much power does it draw, and what does that mean on one battery?
This is the question almost nobody asks and everybody pays for. A small boat with a single battery also runs the trolling motor, the electronics and a bilge pump, and a display left at maximum backlight will eat into that budget fast. The practical rule is to run the unit at medium brightness, keep the backlight timeout short, and power it through a proper fused circuit rather than a accessory socket.
If your boat has a starting battery and a house battery, isolating the electronics onto the house side is the cheapest reliability upgrade available. It is worth checking your boat wiring before the electronics wiring, because a poor connection behind the console causes resets that look like unit failures.
4. Keypad or touchscreen?
This is closer than most buyers expect. Touchscreens give you bigger charts and split-screen layouts, and the 10-inch Lowrance and 9-inch Simrad and Garmin units are noticeably easier to read at speed. Keyed units such as the 53cv and 54cv are faster with wet or gloved hands and never misfire in a swell. If your boat is a skiff where you stand to fish, keys are arguably the better tool despite the smaller screen.
5. What will you add in two years, and will this unit take it?
NMEA 2000 is the marine networking standard, one backbone that lets displays, sensors, engine data, radar, autopilot and AIS share information. If you plan to add a radar dome, a temperature or depth transducer, an autopilot or engine gauges later, buy a networked unit now. The Simrad GO9, the Elite FS 10 and the ECHOMAP UHD2 models all support this, while the HOOK Reveal 5 does not network at all.
Live sonar is the other common future purchase. The Elite FS 10 is ready for ActiveTarget 2 or ActiveTarget 2 XL modules, while most others in this list need different hardware or a different brand’s approach. Decide whether live sonar is on your horizon before you buy, not after.
Charts and the subscription question
Every pick here includes charting, either preloaded or on a card in the box, so navigation works out of the box. Coastal coverage is the one to check carefully, because the US coastal charts on the 54cv and 94sv do not extend to the Bahamas or the Caribbean without an added card.
Ongoing chart cost is where owners get frustrated. Subscription models such as Navionics+ and C-MAP Contour+ charge annually for updates, and over five years of ownership that adds up to a figure most small-boat owners never budget for. Options people use instead: buy the unit with the widest free chart coverage you can find and update on your own schedule, keep the subscription years when you fish new water, or run free NOAA charts through a laptop or tablet with charting software such as OpenCPN.
Whichever route you take, keep a paper chart and a magnetic compass on board. Every experienced skipper we spoke with, including those running full electronics, still carries both as backup, and a GPS unit with a dead antenna is a single point of failure.
Best Marine GPS Chartplotters for Small Boats vs a Phone App
This is the most common question on small-boat forums and it deserves a direct answer. A phone app can do a real job on a boat, and for some people it is the right job.
What an app does well: charts, routes and waypoints for planning, weather, tide data and a magnetometer heading. Navionics Boating and similar apps are cheap or free, they run on hardware you already own, and they need no wiring.
What an app does badly: it is not daylight-readable in the way a marine display is, it dies when your battery is flat, it has no sonar, it can be knocked off a mount in rough water, and a phone left running with GPS active is a meaningful power draw on a small battery.
Our read is that the two cover different jobs. On a boat under 16 feet that never leaves a familiar lake, an app plus a good marine-rated mount and a dedicated battery bank is a defensible setup. Once you are running coastal inlets, crossing unfamiliar water, or fishing structure you need depth for, a chartplotter earns its place.
If you are still comparing the broader electronics picture, our guides to the best marine GPS units for boats and the best boat anchors for small boats cover the supporting gear most skiff owners end up wanting at the same time.
Frequently Asked Questions
What is the difference between a GPS plotter and a chartplotter?
A GPS plotter shows your position as a dot or a track line with basic waypoints. A chartplotter carries full nautical cartography, so it draws coastlines, channels, hazards, depth shading and tides on that position. In practice a plotter tells you where you are, a chartplotter tells you where you can safely go, which is why small-boat buyers should look for a genuine chartplotter rather than a fishfinder with a GPS receiver.
What is the best marine GPS chartplotter for the money?
For most boats under 20 feet the Lowrance Elite FS 10 is the strongest all-around pick because the Active Imaging 3-in-1 transducer, the 10-inch display and preloaded C-MAP DISCOVER charts all arrive in one box. The 9-inch Simrad GO9 is the better value if you want a big screen and networking without stepping up to flagship pricing. The Garmin ECHOMAP UHD2 53cv is the budget answer when the console is tight.
Which chartplotter is better, Garmin or Simrad?
Garmin tends to win on keyed, glove-friendly controls, bundled side-scan on the 94sv and faster setup. Simrad wins on large-screen value, an interface people describe as intuitive, and built-in Ethernet and NMEA 2000 on a mid-tier 9-inch unit. Lowrance, the same parent company as Simrad, wins when you want the most sonar and charting in one package with a clear live-sonar upgrade path.
Is Raymarine better than Garmin?
Neither is better for everyone. Raymarine is the choice if your helm is flush-mounted and you want a permanently integrated look, and its Lighthouse charting and sonar are strong. Garmin is the easier choice on a small open boat because the keyed ECHOMAP units tolerate wet hands, install with less fuss, and cost less to get into. Judge them on screen size you can physically fit, not on spec sheets.
What size chartplotter is best for a boat under 20 feet?
For most boats under 20 feet, 7 inches is the comfortable minimum and 5 inches is the practical floor when a console cutout is small. A 9-inch screen is genuinely better for reading at speed and for split-screen sonar, but it needs real helm space and a suitable cutout. Measure your dash opening and the clearance behind it before choosing, because a unit that does not physically fit is the most common expensive mistake.
Do I need a chartplotter or just a fish finder?
You need a chartplotter if you navigate coastal or unfamiliar water, run inlets, or want depth and position in one sealed unit. You can manage with a fish finder if you only fish familiar water and read a chart by other means. The classic trap is buying a fishfinder with a GPS receiver and assuming it charts, when it does not carry usable nautical cartography.
Will a 7-inch chartplotter drain my battery?
A 7-inch marine display draws roughly around 1 amp at typical brightness, so a full day of trolling is manageable on a single deep-cycle battery. What drains you is maximum backlight, a bright sun mode left on, and powering electronics from the starting battery rather than a house bank. Isolate electronics onto a house battery, use a fused circuit, and set a short backlight timeout.
Conclusion: The Best Marine GPS Chartplotters for Small Boats
The Lowrance Elite FS 10 is our pick for the best marine GPS chartplotters for small boats because it is the only unit here that arrives complete. The Active Imaging 3-in-1 transducer, the 10-inch multi-touch display and preloaded C-MAP DISCOVER charts mean you can mount it and fish it the same afternoon, with a live-sonar upgrade waiting whenever you want it.
If the 10-inch frame will not fit your helm, the decision narrows fast. Take the Simrad GO9 if you want a 9-inch screen with NMEA 2000 and Ethernet at a mid-tier cost, the ECHOMAP UHD2 53cv if your console opening is genuinely small and you fish inland, and the 54cv instead if that same small console needs US coastal charts. The 94sv is the one to buy when your helm has room and side-scan imaging matters more than the outlay.
Measure your cutout, confirm your clearance behind the dash, and decide what you want to add in two years. Get those three answers right and the right unit is easy. For the rest of the gear your small boat needs, our guides to the best trolling motors for small boats and the best jon boats for small lakes cover the two purchases that pair most often with new electronics.