Youtube matey, youtube.
Silent Hunter 4 Dick O'Kane Sonar Only Technique Tutorial by Rockin Robbins, 4 out of 4 hits, impressive.
Silent Hunter 4 WernerSobe Sonar Only Tutorial, (recorded at low quality).
Silent Hunter 4 Sonar Attack and 100% Realism Part 1, (no vocal instructions from the recorder).
Silent Hunter 4 Sonar Attack and 100% Realism Part 2 (same as above)
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