Best Chartplotters for Boats: Screen Size & Mapping Guide

Best chartplotters: quick picks by boat and fishing style

The best chartplotter is the largest bright screen that fits your helm, supports the charts you need, and connects to a transducer suited to your fishing depth and boat setup. For a small open boat, a 7-inch unit is often the practical balance; for a permanent helm on a cruising or offshore boat, 9 to 12 inches is easier to read and operate underway. Choose a standalone chartplotter if navigation is the priority, or a compatible chartplotter/fishfinder combo if you also need sonar.

Among established ranges, Garmin ECHOMAP UHD2 suits many recreational fishing boats, while GPSMAP models offer a broader range of networking and helm configurations. Simrad’s GO series targets compact multifunction setups and its NSX range adds larger-screen options. The right model depends less on the badge than on screen placement, chart coverage, transducer compatibility, and the features you will actually use.

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

Included for 'Best Chartplotters for Boats: Screen Size & Mapping Guide' because the listing specifies 9 Inch Screen and Black, details this guide uses to compare options.

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Garmin ECHOMAP UHD2 54CV Chartplotter/Fishfinder

Included for 'Best Chartplotters for Boats: Screen Size & Mapping Guide' as a relevant option in this category; details come from the product listing.

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Garmin ECHOMAP UHD2 94sv with GT56 Transducer, 9" Touchscreen Chartplotter, Garmin Navionics+ U.S. Coastal

Included for 'Best Chartplotters for Boats: Screen Size & Mapping Guide' because the listing specifies 9" Touchscreen Chartplotter and Garmin Navionics+ U.S. Coastal, details this guide uses to compare options.

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Garmin ECHOMAP UHD2 93sv with GT56 Transducer, 9" Touchscreen Chartplotter, Garmin Navionics+ U.S. Inland

Included for 'Best Chartplotters for Boats: Screen Size & Mapping Guide' because the listing specifies 9" Touchscreen Chartplotter and Garmin Navionics+ U.S. Inland, details this guide uses to compare options.

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Match screen size to the helm, not just the boat length

A screen that looks ample in a showroom can be hard to see from a standing position or behind a windshield. Measure the usable mounting area, including room for the bracket, cables, nearby controls, and enough clearance to tilt or remove the display. Flush-mounted units need a suitable flat panel and access behind it; bracket-mounted units need space for the display to swivel without hitting a wheel, throttle, or companionway.

• 5–7 inches: A space-saving choice for kayaks, tenders, small center consoles, and secondary stations. It can show a chart or sonar clearly, but split-screen views become cramped.
• 9 inches: A useful middle ground for many trailerable boats. It gives charts and sonar more room while remaining easier to fit on a compact console.
• 10–12 inches: Better for a fixed helm, frequent split-screen use, or viewing from farther away. Check power draw, mounting depth, and glare before stepping up.
• 16 inches and larger: Generally intended for roomy helms and networked systems. The added area is valuable for multiple data panels, but the display may be excessive on a small boat.

Diagonal screen measurements do not tell the whole story: aspect ratio, bezel width, brightness, viewing angle, and touch controls in wet conditions all affect usability. A bright display with readable color contrast matters more than a larger screen that washes out in direct sun. If you operate with gloves or spray, check whether the model also has physical keys or a keypad.

Compare the main chartplotter choices

As a rough planning allowance, set aside about 2 inches around a bracket-mounted display for cable bends and movement, then confirm the manufacturer’s template and clearance requirements. For flush mounting, use the cutout drawing rather than the advertised diagonal: housings vary, and a helm panel may hide wiring, structural supports, or other equipment. A 9-inch display can be a poor fit on a crowded console even if the boat itself is large.

Check chart compatibility before choosing a unit

Chartplotters do not all include the same level of map detail. Basic built-in charts may cover common waterways, while optional chart cards or downloads add greater detail such as depth contours, marina information, navigation aids, and fishing features. Coverage and available layers vary by region and chart provider, so confirm that the specific model accepts the chart format you want and that your home waters are included.

• For inland lakes: Look for detailed lake coverage and contour information for the lakes you fish. Do not assume every lake is mapped in detail just because it appears on the base map.
• For coastal boating: Verify the coastline, harbor, and offshore areas you use, along with relevant navigation aids and depth data.
• For frequent travel: Check how chart updates are delivered, whether coverage is purchased by region, and whether the display can store the maps you need.
• For fishing: Compare contour detail and bottom shading where available. Mapping can help locate structure, but it does not replace sonar or guarantee that a feature is present as charted.

Also distinguish chart compatibility from networking compatibility. A display may accept a chart card but not share every chart, sonar source, or waypoint with another brand’s equipment. If you plan to add radar, an autopilot, or another screen later, check supported network connections and the exact devices that can communicate.

Choose the transducer for the fishing you do

A chartplotter can work without a sonar transducer if you only need navigation, but a combo display needs a compatible transducer to show depth and fish-finding returns. Bundled transducers vary by model and may be designed for a particular mounting location. Confirm the display’s supported sonar types, connector, and transducer options before buying; a plug that fits is not proof that every sonar feature will work.

• General freshwater fishing: A transom-mount transducer with conventional sonar is often a sensible starting point. Add down-imaging or side-imaging if seeing structure beside or beneath the boat is important and the display supports it.
• Trolling-motor setup: A trolling-motor-mounted option can keep sonar views aligned with the direction you are fishing. Check shaft diameter, cable routing, and whether the transducer is compatible with the motor’s operation.
• Coastal and deeper-water use: Match the transducer’s frequency and power to the depth range and sonar technology you need. A high-frequency freshwater transducer is not automatically the right choice for deeper offshore sounding.
• Existing through-hull installation: Confirm hull material, deadrise, installation type, and connector compatibility before reusing it. Some transducers need specialist installation or a fairing block.

Mounting can matter as much as the transducer model. Turbulence, bubbles, and a poor position can disrupt returns, especially at speed. On a transom, keep the transducer clear of steps, strakes, and propeller wash, following its installation instructions. If you fish slowly, a position that works at trolling speed may be adequate; if you need readings underway, installation quality becomes more critical.

Use these decision points to narrow the shortlist

• Limited console space: Start with a 5–7-inch display and measure the actual housing and bracket. Prioritize readable charts over a long list of networking features.
• Frequent chart-and-sonar split screen: Favor 9 inches or more. A smaller display may support split view but leave both panels too small to interpret comfortably.
• Fishing is the main purpose: Choose the sonar capability and transducer first, then select a display size that makes returns easy to read. Confirm that the unit supports the specific imaging mode you want.
• Navigation is the main purpose: Put chart coverage, sunlight readability, waypoint handling, and mount position ahead of advanced sonar features.
• Planning future electronics: Map out the intended system—such as radar, autopilot, or a second display—and verify network support now. A cheaper standalone unit may cost more to replace if it cannot join the system later.

Budget for the whole setup

As general market ranges, compact chartplotter or combo units often run about $200–$600, mid-size displays about $500–$1,500, and larger or more network-capable systems from roughly $1,000 to several thousand dollars. These are broad estimates, not quotes: transducer bundles, chart cards, installation, and regional pricing change the total. A chart card may be an additional expense, as can a mount, protective cover, power wiring, and a professional transducer installation.

Before purchase, verify the exact package contents. Some listings include a transducer and maps; others sell the display alone. Also check the power supply requirements and whether your boat’s battery and wiring can support the unit and planned accessories.

Bottom line

For a small boat, a compact 5–7-inch chartplotter keeps the helm manageable; for a versatile fishing setup, 7–9 inches is a strong starting range; and a 9–12-inch screen makes charts and sonar easier to use at a larger helm. The best chartplotters are the ones that fit the mounting space, cover your waters with compatible maps, and support a transducer matched to your boat and fishing depth—not simply the biggest display or the longest feature list.