Relative azimuth is the bearing of the satellite referenced from the bow of the vessel, in a clockwise direction. This is computed considering the ship's heading and the Azimuth.
The Azimuth is counted clockwise from North through 360 degrees. The Azimuth does not change unless the ship moves to a different location. The azimuth stays the same as the ship turns.
The Relative is counted clockwise from the bow through 360 degrees. The Relative changes with heading, as the ship turns.
