1. Correct algorithm is: Compass is rotated, vector is drawn along 'true index' line, both are rotated.
2. Lack of internet is very good.Does not work as a "wind by three drifts" calculator.it perfectly works, I just don't need itPretty decent representation of an e6b.
3. Lacks 'zero' button to align speed 0 (on card) at vector 0.
4. This always draws the vector along compass North line.
5. Lacks 'fast/slow' button for speed of rotation.
6. Display doesn't flip when the tablet is upside-down.