I' boat in Jamaica Bay and I have a lot of fishing buddies. Some share everything including co-ords and some give general locations. A few don't tell at all but not a lot. What you won't get is folks on the VHF( 68 and 10) responding to your queries about "where are the fish?"
I won't answer those calls and find them quite annoying. Sometimes you may get a response but it may be a ruse or a joke
Once in a while, you will hear a radio call like "we're killing em at the ....."
My advice for Jamaica Bay and outside near shore is in general, if you see several boats fishing, that is where the fish are or will be at some particular time. If you see boats all of a sudden start to leave a spot, the fish have left. Also keep in mind that if you go where the boats are, you need to be fishing for the same species usually.