Coastal Nav Calc converts courses between true, magnetic and compass!
With this app you never need to lookup you deviation card again. Just enter it once into the app and it automatic converts between any compass, magnetic and true course.
You can store variation's as well. Just enter the details from your charts compass rose into the app and Coastal Nav Calc is calculating the variation for the current year based on that information and uses it for all converstions.
The basic version contains ads and allows you to store one deviation table and two compass rose's. But you can upgrade within the app to the Pro version. The Pro version gives you unlimited deviationt tables, unlimited compass rose's and no ads.