In fact, ship ID book is only useful to me to get ship length for getting estimate speed with U-Jagd. When i don’t have time to identify the one i want in a convoy, i take one easily identified and get its speed for all the others.
If ship is alone and can’t identify him, i guess its length (up to 100m/150m/200m) for U-Jagd, and compare the different speed given by U-Jagd to match reality.
Don’t need really the distance to target as i always try to be close around 1000m.
AOB is the easiest to estimate when i know the ship course (via the AOB dial)
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