Oops sorry mis-read that. I am not exactly sure what type of radar the subs had, but I know land based radars, one was able to calculate range. For example the radars used by the RAF during the battle of Britian.
But I would guess the u-boat radar isn't as sophisticated as land based ones. However I could only be totally wrong. I am sure one the u-boat grognard will answer your question soon enough.
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