85mm Digital GPS Speedometer
| Diameter | 85mm |
|---|---|
| Speed units | knots / mph / km/h (0-99) |
| Display | speed (SOG) and compass heading (COG) |
| GPS aerial | high-sensitivity, included |
| Screen | backlit LCD |
| Waterproof rating | IP56 (dust and spray) |
| Power | 12V (resistor included for 24V) |
| Face | black or white |
| Bezel | black or white plastic, or 316 stainless |
A GPS speedometer that shows true speed over ground and a compass heading on a single 85mm LCD display, with no sender, paddlewheel or through-hull fitting to install. Because it reads position from satellites, the speed isn't affected by water flow, tide or wheel size — it's the same accurate reading on the water or on the road.
Speed can be shown in knots, mph or km/h (0–99). It's especially useful where you need a dependable reading at low speed: on rivers and in speed-restricted zones it stays accurate down to around 1 knot, where a paddlewheel log struggles.
- 85mm (3⅜") diameter — fits a standard large-gauge opening
- Speed (SOG) and compass heading (COG) on a clear backlit LCD
- Units switchable between knots, mph and km/h
- High-sensitivity GPS aerial included — plugs straight into the gauge
- 12V, with a dropping resistor included for 24V systems
- IP56 — protected against dust and spray
- Choice of black or white face, with a stainless, black or white bezel
The aerial needs a clear view of the sky — mount it outside, or inside behind the windscreen — and plugs into the socket on the back; don't cut the cable. On power-up it takes about a minute to find the satellites, and because the reading comes from movement, the speed and compass only update once you're under way.
The display is for reference only and should not be used as your sole means of navigation.
Running on 24V? Fit the included resistor, or feed the dashboard from a voltage regulator for a cleaner, steadier supply (why this matters →). Prefer a traditional dial? See the analogue GPS speedometer →, or browse all speed gauges →.
| Diameter | 85mm |
|---|---|
| Speed units | knots / mph / km/h (0-99) |
| Display | speed (SOG) and compass heading (COG) |
| GPS aerial | high-sensitivity, included |
| Screen | backlit LCD |
| Waterproof rating | IP56 (dust and spray) |
| Power | 12V (resistor included for 24V) |
| Face | black or white |
| Bezel | black or white plastic, or 316 stainless |
A GPS speedometer that shows true speed over ground and a compass heading on a single 85mm LCD display, with no sender, paddlewheel or through-hull fitting to install. Because it reads position from satellites, the speed isn't affected by water flow, tide or wheel size — it's the same accurate reading on the water or on the road.
Speed can be shown in knots, mph or km/h (0–99). It's especially useful where you need a dependable reading at low speed: on rivers and in speed-restricted zones it stays accurate down to around 1 knot, where a paddlewheel log struggles.
- 85mm (3⅜") diameter — fits a standard large-gauge opening
- Speed (SOG) and compass heading (COG) on a clear backlit LCD
- Units switchable between knots, mph and km/h
- High-sensitivity GPS aerial included — plugs straight into the gauge
- 12V, with a dropping resistor included for 24V systems
- IP56 — protected against dust and spray
- Choice of black or white face, with a stainless, black or white bezel
The aerial needs a clear view of the sky — mount it outside, or inside behind the windscreen — and plugs into the socket on the back; don't cut the cable. On power-up it takes about a minute to find the satellites, and because the reading comes from movement, the speed and compass only update once you're under way.
The display is for reference only and should not be used as your sole means of navigation.
Running on 24V? Fit the included resistor, or feed the dashboard from a voltage regulator for a cleaner, steadier supply (why this matters →). Prefer a traditional dial? See the analogue GPS speedometer →, or browse all speed gauges →.
Fitting on 12V or 24V — and why a voltage regulator helps
A 12V system is never a steady 12V: it sags under load, rises to 14V or more on charge, and spikes as things switch on and off. The gauge sees all of it, so readings can wander with the state of the electrics rather than with what you’re measuring. A voltage regulator delivers a clean, steady voltage whatever the supply is doing — so the gauge reads consistently, the backlight stays even, and sensitive electronics are protected from spikes.
On a 24V system a dropping resistor is supplied to suit the gauge, but a regulator is the better option: resistors run hot, waste power and add a failure point at each gauge, whereas one regulator feeds the whole dashboard from a single clean supply (the 3A model runs up to 20 standard 52mm gauges, the 5A up to 38).
Why voltage regulators matter → · Browse voltage regulators →