Just look at the red and green sections of the AOB dial, that is how I figure it out. The green is for when you are on the starbord, right, side of the target and the red is for when you are on the port, left, side of the target.
If you find your self behind a target and can't find your way around to the front without giving your self away or escorts make this problamatic you can still kill the target with ease. Though the accuracy of your data is paramount for this work. When you ID your target you can find the depth of the keel in your target recognition manual, the number is generaly diferant for every ship. Simply set your torpido's running depth to about 1m lower than the value given in the manual, so if the keel is at 6.5m set for between 7.5 and 8. Then make sure your torpido is set up with a magnetic pistol, by defult they all should be, and let fly with your shot, well swim but you get the idea. The torpido will cruse in right underneeth the target and blow up somewhere underneeth it. This causes herendous damage to your target and negates the need for a 90deg shot in most situations; though the 90deg is still your best bet for a good hit.
As for 90deg shots, range isn't all that important, as long as the target is inside around 1500m. The only time range realy matters is when your are realy close to bow on or stern on with your target, your extreem AOBs.
The speed measuring with the map, the 3:15 method, your speed dosen't effect your results. At least not as far as I can tell. It is beacouse you are measuring the target's movment relitive to the Earth and not the target's movment relitive to you; at least that is how I understand it to work.
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