the Fitbit mobile app
The app is designed for small dinghies and catamarans.
The countdown has a sync feature and vibrates on countdown. (use the right buttons)
You can set the Commitboat Boat and pin position, the app gives you the distance to the startline
The sailed route will be plotted. The color of the route ranges from red to green (slowest to maxium speed). It curretly logs with an interval of 20 seconds or when the heading is changed by more than 10 degrees.
This app features
Visual tracking (covered path)
Distance to line
Start line Bias
Distinction between upwind and downwind speeds with averages
Screen with raw numbers (heading and speed)
Settings page to take control over certain parameters
Please consider making a donation: https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=3Q2MDZA3TWFT8¤cy_code=EUR&source=url
the app is currently free but will maybe become a paid version