Today we were running from Sag to MVY (on 141' Trinity) as soon as we pass Plum Island we run into Heavy fog. Horn on. Bosun on bow. Mate on one radar at 3.5 miles passing me traffic on my radar set at 1 mile, Captain working the radio and zigging and zagging and calling out his moves. Came to a dead stop multiple times to let idiots, with no right of way, pass by at 20+knots. Mostly CC and Sportfish. Most moving to fast to raise on the radio, because you cant keep up with their positions (L/L wise) and they have no AIS! As many boats as we saw on Radar, 2 had AIS (not counting the ferries). This went on for 3 hours, very intense. One chuckle head in an Azimuth was blowing along at 26kts coming from our Starboard side. Visabilty was Approx 200'. we come to a dead stop (again). we watch him cross us on radar. about then our horns sound, dude must have freaked! he whips a 180 and passes across us again, 100 feet away! Never once slowing down! Just another day boating with the masses!