Most of the radars in SH3 are practically useless, since radar equipped enemies will 'see' you when you 'see' them. They're handy when tracking lone merchants in bad weather, though.
Your best friend for enemy detection is the radar detector. Normally it should detect radar signals before the enemy radar can detect you, since there is always a little loss of signals when radar signals are reflected. As soon as you get the 'Detecting radar signals!' message, dive and scan with the hydrophone. If you can't hear any ships, it's an aircraft.
I'm not sure if this superior radar detector range is working properly in standard SH3, but it's fixed in Jungman's SensorPak. I think it's improved in RUb 1.43 as well, but I'm not sure yet (still in 1940 in my RUb career).
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