Try to detect contacts first on narrowband sonar. Mostly you can detect and track a contacs low frequency signature (often just one line) before you can see a contac or assign a tracker on the broadband sonar (waterfall display).
I use the narrowband sonar to find contact if I have no contact on broadband, and that's as far as I know the autocrew also is doing. So if you switch autocrew on you wonder they suddenly mark contacs in broadband which are actually marked in narrowband. The tracker of course also appears on broadband, so you may think autocrew can detect contacs you don't even see.
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