relative course

Finally he said, "Can you get me the relative courses?"

Consensus was that due to the relative course angles, the other probably hadn't spotted the Deux at all.

This was a fairly complex system of rotating rings and sliders that allowed the bomb aimer to dial in the relative course of the target and its estimated speed.

Whenever one spots anything it swings a light on it-that's what happened when that light swung toward us, up there in the prow-and automatic calculating machines compute and announce direction, distance, relative course, and so on."

The Battenberg Course Indicator is a mechanical calculating device invented by Prince Louis of Battenberg in 1892 for determining the relative course and speed of other vessels compared to the user's own ship.