the Fitbit mobile app
Aimed at rowers (coxes and coaches), displays on the water speed as 500m split time' in minutes:seconds.
Large display shows current split, below that it also shows elapsed time, distance, the best and average split times.
After starting the app, there is a flashing red 'GPS' sign to indicate that the app is waiting for GPS.
Once GPS is OK, press 'up' button to start logging distance / time. Press 'up' again at end of your piece, this will 'freeze' the display so that average / best split can be read. Down button resets distance, time, average and best split times.
The split time is maximized to 8:00, i.e. if the pace is slower than that, (such as a stationary boat), the display will still show 8:00.
The app is for Ionic only, it is free for 1 day, after which a payment of $2.99 is required.