The App Tack Optimizer (TO) will let you get the best from your boat whether you are in a race or in a passage. You simply enter your boat’s polar coordinates then, while sailing, you enter bearing, strength, and direction of the wind and TO will immediately calculate your best tack. Between a shorter, and slow tight tack, and a longer, and fast wide tack, it will be easily calculated by TO, the fastest way to reach your target, the fastest tack. TO also update you with sail parameters like speed VMG etc.