In the US Navy (submarines), we have a similar tool used to help visualize the effect of course and relative bearing on speed relative to the target (perpendicular to the target or directly toward or away from)
It can also be used to calculate range (I know, right?), speed, course of a target, as well as help make an educated decision about your new course to enhance your ability to maintain or improve position relative to a target.
Unfortunately, I've never seen one on a US sub with that "arm"... Looks like it could be used to help visualize/calculate a good intercept, too...?
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