BoatSpeedy
GPS speedometer and waterway navigation for boats, with battery analytics
Version: 1.4.1
Added: 17-09-2026
Updated: 17-09-2026
Added: 17-09-2026
Updated: 17-09-2026
GPS boat speedometer and navigation for small boats. Under motor, paddle or oars. A Bluetooth BMS or a coulometer on the pack adds live values and range.
Navigation
* Set a destination on the map: straight line or a route along the waterways, with distance and estimated draw
* Load map data onto the device, then route offline up to 600 km
* Craft type, motorboat or canoe, decides which bans apply
* Locks and weirs on the route, tap one for hours, phone and chamber size
* Seamarks are tappable, speed signs show their number
* Map north up or course up, marker and map glide
Speed and trip
* Large readout, km/h or knots, decimals configurable
* Start and stop through a foreground service, keeps measuring with the screen off
* Trip history with distance, times, Ah, Wh and Wh/km, GPX export and import
* Satellite and GPS status, smoothing of the raw value
Battery (Bluetooth LE)
* Several packs, wiring single, parallel or series
* Voltage, current, state of charge, remaining Ah, temperature, cells
* Range and remaining time at the current speed, time-averaged
* JBD and Redodo/LiTime/Power Queen verified on hardware, Daly and JK experimental
* Coulometer with a Hall sensor for packs without Bluetooth, verified too
* Charging mode with time to full and an alert at a chosen level
Weather and safety
* DWD rain radar, readings from the nearest station, wind direction
* Weather warnings for thunderstorm and storm
* Anchor watch with a drag alarm
What the app talks to
* Base map from OpenStreetMap, seamark overlay from tiles.openseamap.org
* Waterway tiles for routing from boatspeedy.wozise.de, a server run by the author. The data comes from OpenStreetMap, the generator is open source (Glenn-Dandy/boatspeedy-mapdata)
* Without matching tiles, routing asks the public Overpass servers
* Weather and warnings from the Deutscher Wetterdienst, via maps.dwd.de and api.brightsky.dev
* Update check at api.github.com, only when you tap it
Free and open source, without Google Play Services. Maps and waterways © OpenStreetMap contributors (ODbL), seamarks OpenSeaMap (CC BY-SA), weather from the Deutscher Wetterdienst (CC BY 4.0).
Navigation
* Set a destination on the map: straight line or a route along the waterways, with distance and estimated draw
* Load map data onto the device, then route offline up to 600 km
* Craft type, motorboat or canoe, decides which bans apply
* Locks and weirs on the route, tap one for hours, phone and chamber size
* Seamarks are tappable, speed signs show their number
* Map north up or course up, marker and map glide
Speed and trip
* Large readout, km/h or knots, decimals configurable
* Start and stop through a foreground service, keeps measuring with the screen off
* Trip history with distance, times, Ah, Wh and Wh/km, GPX export and import
* Satellite and GPS status, smoothing of the raw value
Battery (Bluetooth LE)
* Several packs, wiring single, parallel or series
* Voltage, current, state of charge, remaining Ah, temperature, cells
* Range and remaining time at the current speed, time-averaged
* JBD and Redodo/LiTime/Power Queen verified on hardware, Daly and JK experimental
* Coulometer with a Hall sensor for packs without Bluetooth, verified too
* Charging mode with time to full and an alert at a chosen level
Weather and safety
* DWD rain radar, readings from the nearest station, wind direction
* Weather warnings for thunderstorm and storm
* Anchor watch with a drag alarm
What the app talks to
* Base map from OpenStreetMap, seamark overlay from tiles.openseamap.org
* Waterway tiles for routing from boatspeedy.wozise.de, a server run by the author. The data comes from OpenStreetMap, the generator is open source (Glenn-Dandy/boatspeedy-mapdata)
* Without matching tiles, routing asks the public Overpass servers
* Weather and warnings from the Deutscher Wetterdienst, via maps.dwd.de and api.brightsky.dev
* Update check at api.github.com, only when you tap it
Free and open source, without Google Play Services. Maps and waterways © OpenStreetMap contributors (ODbL), seamarks OpenSeaMap (CC BY-SA), weather from the Deutscher Wetterdienst (CC BY 4.0).