@Argho: I think in situations where you aren't getting any fish at all anymore (i.e. overfishing completely in effect), using 2 skilled lookouts together with 2-3 sonars and 2 searchlights should make a difference. There was this one guy who had over 80 fish in the first days and he didn't use much fishing equip, but he had 2 lookouts, 2 sonars and 2 searchlights (one big and one small) and the duplex radar (though I think that one was irrelevant?).

Community content is available under CC-BY-SA unless otherwise noted.