Second and final of two movies that actors David Warner and Michael Caine both worked on. The first had been Ivan Passer's Silver Bears (1978) made and released around a couple of years earlier.
In the film's story, the estimated number of vessels that had in three years gone missing in the Bermuda Triangle was 610 pleasure craft with over two thousand people sailing on them.
The fictional vessel, the United States Coast Guard cutter (USCGS) "New Hope", was portrayed by the real life USCGC, the "Dauntless" (WMEC-624). This movie is one of two films that she has appeared, the other being Licence to Kill (1989). Coast Guard cutter USCGC Dauntless (WMEC 624) used to deploy out of Florida, but now is home ported in Galveston, Texas.
The machine gun mounts on the bridge wings of Reliance class cutters like the one featured in the film have stops that prevent traversing the gun so that it fires on the ship's flight deck. Blair Maynard could not have used the Dauntless' .50 caliber machine gun to attack the pirates the way that he does at the end of the film.
At the end, when Caine swings the machine gun around and kills the pirates, is an impossible act. The mount only settings in an outward arc, making it impossible to fire on the helo deck that way.