1. Draw a sketch.

2. The flight of the airplane is described by and the wind can be described by

3. Therefore the course over ground (cog) is . That means:

4. To calculate use the tan-function:

5. I've no idea where the given result comes from What I mean: The pilot is steering N, the airplane is flying N5.98°E so it must be sufficient if the pilot steers to N5.98°W ...?