Race Sailing Tack Optimizer Pro Edition

Race Sailing App to help you be the fastest boat on the race course

Get the free version with ADS and limited features here:


This app is inspired by the RaceMaster TacTic compass and gives you similar information.

The course over ground and speed is determined by GPS this way taking fx current into consideration.

You can see if you are sailing the best VMG when tacking and when you sail downwind fx in light conditions you also optimize the VMG for getting down to the gate/bottom mark first :)

The display changes color telling you which tack you are on. So green means you are on a starboard tack.

This is only when you are using the app in VMG mode where you have set the course towards the top mark.

Use the app to help you giving you some more information while sailing. Remember that finding the stronger wind and doing the right decisions is more important than looking at instruments.

• Added a third page with Race Signal flags, hullspeed calculator and version info
• High contrast mode is now available giving the display a B/W look
• Adjust timer minutes by swiping up/down on the Race Timer Display
• You can now choose to use sound beeps instead of the talking timer
• Can now show speed and track if desired by setting angle to "OFF"
• Display can be locked/unlocked by doing a long click on the VMG display
• Upsampling can be enabled to make the display more responsive


Happy racing - and remember to have fun doing so ..../)
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What's New

Fix for url to dahlhof.com/rsto
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Additional Information

Eligible for Family Library
Eligible if bought after 7/2/2016. Learn More
January 15, 2020
Current Version
Requires Android
4.1 and up
Content Rating
Offered By
Flemming Dahlhof Jensen
Marselisborg Havnevej 54 8000 Aarhus C DK - Denmark
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