Take your cell phone
on board.
Boadspeed has well readable displays and supports night-mode.
Measure in meters, nautical miles or statute miles as you prefer.
Export your tracking data of one or more days to gpx, csv and as image.
After countdown the progam automatically switches to the speed view.
Boatspeed tells you your speed, course and during regatta countdown the time to start.
Lets you sleep calm at night.
using other android apps inlcuding google maps.
form other sources and edit them as new routes.
Boatspeed is in active development.
If you like it please by the ad-free version for about 5 Euro (price differs by country).