Several English-speaking stations talking to each other about boating, unemployment in Florida, crews from Cuba, working in Lake Charles, Louisiana, etc. Callsigns are either numerical or simply the other stations' first name (Cicil, 7508, Janine, etc). Talking trash about other boaters, crews etc ("any of y'all been sailing with Andrews lately?") Several instances of stations talking over each other.
I'm calling this a net but there's no net control station. No actual callsigns heard after ~15 minutes of listening. Very informal conversation, likely a regular net. 4149 kHz USB is one of the 4 MHz marine HF-SSB simplex frequencies, designated "channel 4B".