US subs are entirely different. I don't understand how measuring AOB from a protractor using the target track is somehow "unrealistic." Is there some reason that couldn't be done in the war?
American boats mostly relied on visual estimates of AoB. If you are practiced as they were you can be plenty close enough. You can certainly be as close as the periscope devices the U-Boats used, which depended on knowing ship length. Historically, way more than half the targets attacked were misidentified, and so the AoB derived from periscope wizardry would be very, very wrong. The visual eyeball estimate would be much closer, both in game and reality.
You also have to realize that the radar equipped American boats had plenty of accuracy to do the protractor method with complete accuracy, with positions plotted to plus or minus 30 feet regardless of range. That made American targeting magnitudes more precise than German targeting.
That doesn't really matter though. A well planned attack considers the magnitude of possible error and mitigates innacuracy so that bad information still results in hits.
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