The first radar set on the Type VII was the FuMO-29. IIRC, first seen in late '42 or early '43. It consisted of 12 dipole antenna (six for sending and 6 for receiving) located around the front of the bridge. It was limited to a 60-degree arc and could locate contacts up to about 2+ nautical miles depending on weather.
The second radar set on the Type VII was the FuMO-30. IIRC, first seen around April or May '43. It was the first radar set with a revolving antenna (thus a 360-degree arc) that stored on the port side of the conning tower. It had a little bit greater distance than the FuMO-29.
The FuMO sets should not be confused with the Metox (FuMB) which came out in mid to late '42 and was know as the Biscay Cross. This was the first radar detection unit for air and sea. It could detect the allies radar at a great distance than could the allies detect the u-boat. This was later followed by Nexus and other units as the Allies change radar frequencies.
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