What Chartplotter Screen Size Works Best at the Helm or Nav Station?

Key Takeaways: If you want a chartplotter you can actually read from the helm without squinting, the sweet spot for most cruising sailboats is a 9 to 12 inch display. A 7 inch unit works fine at a nav station or on a small pedestal, while 12 to 16 inch screens suit centre cockpit yachts, pilothouses, and skippers who run radar overlay or multiple data panes. The real test is simple: if you can’t read depth, AIS targets, and laylines at a glance in bright sun, the screen is too small.

Why Screen Size Matters More Than People Think
The Sweet Spot for Most Cruising Helms
When a 7 Inch Display Still Makes Sense
When You’ll Appreciate 12 to 16 Inches
Viewing Distance, Glare, and Mounting Height
Radar Overlay, AIS Target Density, and Split Screen Use
Cockpit Layouts: Wheel, Tiller, Centre Cockpit, and Pilothouse Considerations
Touchscreen vs Hybrid Controls at Different Sizes
Power Draw, Networking, and Upgrade Planning
Summing Up

Why Screen Size Matters More Than People Think

Most sailors focus on brand, charts, or networking, but the one thing that shapes day to day usability is screen size. RYA instructors, World Sailing training materials, and long distance cruisers on YBW Forums and Attainable Adventure Cruising all echo the same point: if the display is too small, you’ll stop using half the features you paid for.

A chartplotter is only useful if you can read it while the boat is moving, the sun is bouncing off the water, and you’re trying to keep a course. That’s why size, brightness, and viewing distance matter more than raw resolution.

The Sweet Spot for Most Cruising Helms

For the typical 30 to 45 foot cruising yacht with a wheel pedestal, a 9 to 12 inch display hits the balance between:

Readability from 60 to 90 centimetres

Enough chart detail to see depth contours and hazards

Space for AIS targets without clutter

Split screen use without everything shrinking to postage stamps

A mounting footprint that fits most pedestals

When a 7 Inch Display Still Makes Sense

A 7 inch plotter isn’t obsolete. It still works well when:

The unit is mounted at a nav station

The helm is small or tiller steered

You mainly use it for depth, GPS position, and simple charting

You rely on a tablet or phone as a secondary display

You’re sailing a smaller boat where space is tight

Users often report that a 7 inch screen is fine for coastal cruising if you’re not running radar overlay or heavy AIS traffic.

When You’ll Appreciate 12 to 16 Inches

Larger displays shine when you need more information at once. They’re ideal for:

Centre cockpit yachts where the helm is further from the screen

Pilothouse and deck saloon boats

Skippers who run radar overlay full time

High AIS density areas

Offshore passages where you want multiple data panes visible

Need help deciding which chartplotter suits your boat and your budget?
Click here to see my recommended models and comparison table.

Viewing Distance, Glare, and Mounting Height

This is the part most sailors underestimate.

Viewing distance: If your eyes are more than a metre from the screen, a 7 inch display becomes hard work. Even a 9 inch unit can feel small on a centre cockpit pedestal.

Glare: Sunlight bouncing off the water can wash out smaller screens. Larger displays with higher brightness ratings (1,200 to 1,500 nits) stay readable longer.

Mounting height: If the plotter is too low, you’ll end up bending forward to read it. Too high, and the viewing angle washes out the colours. A larger screen gives you more margin.

Radar Overlay, AIS Target Density, and Split Screen Use

If you use radar overlay, a bigger screen isn’t a luxury. It’s a practical requirement.

Radar targets need space to separate clearly

AIS symbols multiply quickly in busy waters

Split screen chart plus radar or chart plus sonar halves your usable area

ASA instructors often advise that if you plan to run radar overlay routinely, 12 inches should be your starting point.

Cockpit Layouts: Wheel, Tiller, Centre Cockpit, and Pilothouse Considerations

Wheel steering: A 9 or 12 inch unit fits most pedestals and keeps the screen close enough to read while steering.

Tiller boats: A 7 or 9 inch display mounted on the bulkhead works well, as you’re usually closer to the screen.

Centre cockpit yachts: The helm is further from the pedestal, so 12 to 16 inches becomes far more practical.

Pilothouse or deck saloon: You’re often seated further away, and the screen competes with interior reflections. Bigger is better.

Touchscreen vs Hybrid Controls at Different Sizes

Touchscreens work beautifully on larger displays, but on smaller units they can feel fiddly in a seaway. Hybrid controls (knobs and buttons) are still valued by offshore sailors because:

Wet fingers confuse touchscreens

Small icons are harder to hit on 7 inch displays

Physical controls are easier when the boat is bouncing

This is why many long distance cruisers still favour hybrid units in the 9 inch range.

Power Draw, Networking, and Upgrade Planning

Larger screens draw more power, but the difference between a 9 and 12 inch unit is usually modest. The bigger considerations are:

Network bandwidth for radar and AIS

Whether your pedestal can take the footprint

Future upgrades like a second helm display

Cable routing and NMEA 2000 backbone length

If you’re planning a full electronics refresh, it’s worth choosing the screen size first, then building the network around it.

Screen Size	Best For	Notes
7 inch	Nav stations, small cockpits, tiller boats	Readable up close but limited for radar or split screen
9 inch	Most wheel helms on 30 to 45 foot cruisers	Good balance of size, clarity, and pedestal fit
12 inch	Centre cockpits, offshore helms, radar overlay users	Excellent for AIS density and multi pane layouts
16 inch	Pilothouses, deck saloons, large yachts	Superb visibility at distance but needs space and power

Summing Up

Choosing the right chartplotter size isn’t about fashion or brand loyalty. It’s about whether you can read the screen instantly while steering the boat. For most cruising sailors, a 9 to 12 inch display is the sweet spot. Smaller units still work in tight spaces, and larger ones shine when you’re further from the screen or running radar overlay. If you can see depth, AIS targets, and your course line without leaning forward, you’ve chosen the right size.

This article was written by Dick McClary, RYA Yachtmaster and author of the RYA publications 'Offshore Sailing' and 'Fishing Afloat', member of The Yachting Journalists Association (YJA), erstwhile member of the Ocean Cruising Club (OCC) and owner/administrator of 'Liveaboard Sailboats for Sale'.