Elvstrøm Starter will help you make the perfect start when sailboat racing.
Mark the ends of the line, and Elvstrøm Starter will tell you how far you are from the line and how long time it'll take you to get to the line at current speed and heading.
To help you time the start correct, Elvstrøm Starter has a configurable count down clock with sync function
Updated to support the new devices.
Ratings and Reviews
Simple and efficient starting timer
I've been using iRegatta and still find it has some benefits over this app. However, you can't beat free. Two features that would bring it up closer to par would be to allow landscape mode (which happens to match how I strap my iPhone to my arm) and adding an offset (specifying how far from the bow I sit … it matters when you sail on bigger boats).
For an added bonus I'd consider adding wind tracking a la North Sails Tactician (basically just a way to keep track of wind shifts) … this would also integrate nicely with the starting line (now I just tells you the neutral wind direction, but if you added information about the current wind direction it could keep you informed of the favored side.
Worth the price
Well, maybe not. Sometimes even free isn't a great deal. I deleted it after about two minutes.
The Sync button resets the time back to the original. I've never seen a race starter do that---sync always jumps to the next minute down and the seconds go to zero. I can't imagine anyone wanting it to jump back to the original time.
Plenty of good free ones to choose from.
With Family Sharing set up, up to six family members can use this app.