Before May 1943, you can use the matching speed method on the surface. After that, it is hard to stay on the surface.
Determine target course, and get on a parallel course. Note the bearing. Fiddle with your speed, until the bearing doesn't change anymore. Now your speed should equal the target speed.
Very easy to do during your overhaul manuever.
But once allied aircover and radar do not allow you to overhaul on the surface, you need to use the change in bearing method discussed above.
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
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