I strongly suggest above 2 of you try OLC GUI with U-jagd Tools first then we discuss later.
By U-jagd Tools method, the speed is calculate by the ship length and the time ship pass the line. It's simple and accurate if AOB is not small. May be it seems not good for you need know the ship length first. But what I can say is if your u-boat don't move, all the parameters you measured is related to the ship dimension you estimated or identified. If your u-boat move, then you may get the solution not depend on ship dimension.
And about the AOB/Ranger finder, in fact it's a slide rule. Just because SH3 limitation so it had to be made to rotate not slide. So use it nothing with cheat. If you use U-jagd Tools method, then you don't need stock game standard 3 step method then you can found there are no necessary to disable the Lock function.
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