I do have the OLC Gui mod, and I love it to bits. But I must admit I spend most of my time drawing on the navmap. I.e. drawing hydrophone bearings and attempting to fit a course in between them. Once I have that I try to draw a speed diagram to get an intercept course, maintain distance/'go roundabout' or for avoidance. And when visual contact is made simply taking my watch-officer's range/bearing reports and plot them. So by the time I am ahead of the target (at 90 degrees) I don't have to look through the scope anymore to get an AOB, speed or range. But I rely heavily on the built-in Attackdisk and Range/AOB calculator in OLC's Gui to get those.
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