It's even not historical that u-boats used map plotting for their attacks. They used a device like this:
http://subsim.com/radioroom/showthre...ght=whiz+wheel
Play around with the TDC and you will also recognize that (with every other setting fixed) the target's speed has a major impact on the calculated gyro angle. Small errors in AoB and range produce way less differences in the shot direction.
Get as close as you can for your attacks, at best under 1km. Of course this depends on escorts nearby, visibility etc, too.
This strange thing with the time on impact mentioned above doesn't disturb your shot's precision.
Try to keep the gyro angle < 10°, it doesn't matter whether you have the target coming from port or starboard.
Although this sounds really strange, indeed :hmm: Never realized before.
Thanks for the input