I see this listed in the US Marine VHF Allocation as US Government only. What is this frequency used for and by whom? I am in the Salt Lake City area and hear traffic on here quite frequently. I haven't figured out what they are talking about, it sounds like two stations casually moving around. Occasionally the transmissions are scrambled using simple speech inversion technology. I hear profanity occasionally which leads me to believe that these aren't government stations. There are several large bring shrimp egg harvesting operations on the lake but that have sophisticated digital encrypted comms to keep their operations secret from the competition. Any thoughts?