Knowing about a thermal layer is realy only valuable in the attack, if you are going to try to come in submerged.
If you are being attacked, you are going to dive and stay as deep as possible. Just because there is a thermal layer at 70m, I am still going to dive to 200m. If a thermal layer is there you are lucky, but otherwise it shouldn't really effect your tactics.
Also, the Germans did have some instrument for measuring thermal layers
U.Kdt.Hdb III.57.a Continual observation and measuring of water densities and temperatures are therefore important and indespensible, for establishing the presence of "stratification" when submerging to considerable depths as a means of evading pursuit by position finding.
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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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