I don't know about a missile launched from the beach but I was a surface missile Fire Controlman. The closest ship was over a hundred miles away.
The aircraft was at 12k feet. You can't see an aircraft at that altitude on radar from that distance because of the curvature of the earth much less hit it with a missile.
"The closest ship was over a hundred miles away. "
IIRC, the US Navy initially denied being in the area at the time. They later admitted to being in the area. I don't know whether this was more or less than 100 miles.
How many small private vessels were in the area? I'm not proposing any specific scenarios, but I do know that the whole exploding tank theory and the CIA video are an insult to anyone with any intelligence who has studied the events, witness statements, and the evidence.
So until I hear a reasonable theory for what brought the plane down, I'm going to go with the scores of credible witnesses who saw a streak rise from the ocean/horizon and impact the aircraft.