http://www8.garmin.com/aboutGPS/glossary.htmlAzimuth
The horizontal direction from one point on the earth to another, measured clockwise in degrees (0-360) from a north or south reference line. An azimuth is also called a bearing.
Bearing
The compass direction from a position to a destination, measured to the nearest degree (also call an azimuth). In a GPS receiver, bearing usually refers to the direction to a waypoint.
Course
The direction from the beginning landmark of a course to its destination (measured in degrees, radians, or mils), or the direction from a route waypoint to the next waypoint in the route segment.
Heading
The direction in which a vehicle is moving. For air and sea operations, this may differ from actual Course Over Ground (COG) due to winds, currents, etc.
Demnach wäre "Bearing" oder Course sowas wie Zielrichtung oder Kurs(richtung) und Heading entspräche in etwa Fahrtrichtung
Azimuth wäre, soweit ich das verstehe, gleich "Bearing" oder Zielrichtung in Grad (Winkel) zu Kompass-Nord.
justmy2cents