Mainly, it serves like the light on a bug-zapper. You turn on your radar, wait for the planes to start circling, then zap them with the flak.
The best way to use your radar is sporatically. Turn it on for a few sweeps, then turn it back off. You need to use it especially in heavy weather, but you should also be using your hydrophones. Dive and listen every 3-4 hours, then surface and sweep twice every 30 minutes or so. You shouldn't be using your radar for attack approaches. It's only for searching, or it'll get you killed right quick.
And if you are intercepting a known convoy, then you shouldn't be using it at all. Those escorts will charge right out to meet you if you flip on your radar; use your hydrophones and plotting skills, instead.
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