Since I wasn't in on the development of the sensors, I can't say for sure that you will always detect the radar before being detected. However with extensive testing of the radar coverage in the Bay of Biscay, I found the following:
Ships have more trouble detecting you than air cover does; and with time compression up to 128, if I immediately crash dived, the destroyers never detected me.
This is not true for air cover. If I ran 16x or above, they detected me. At 8x, if I immediately crash dive, they usually missed me, but not always. Perhaps due to the closing speed of up to 300 knots, you don't have the time to react.
This was the testing in 1943. Perhaps in earlier years you could get away with higher time compressions.
The air cover radar was extensively tested and retested and set and reset many times. And as the years progressed into 1944 and 1945, it became almost impossible to evade.
I hope this helps.
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Irish1958
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