Angle on the bow is nothing more than your bearing from the target's perspective, expressed as an angle from 0º at the bow and 180º off the stern and a designation starboard or port to separate the two 180º ranges.
So if a watchman on the target sees you 90º off his starboard bow, your AoB is 90º starboard.
From your point of view, if you're looking at the target's starboard side, the AoB is also starboard.
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