The ship that is the centerpiece of the movie is a Type 23 Frigate, which was played by the real-life Royal Navy frigates HMS Monmouth and HMS Montrose.
At one point the ship fires a Harpoon missile to deal with an incoming target. You can just make out the missile waver slightly when it fires. When this sequence was filmed, one of the missiles veered right off course and actually turned around on a collision course with the ship; however it fell harmlessly into the sea several hundred feet short.
The movie is the centerpiece of a navy-funded tourist attraction in Portsmouth Historic Dockyard, England. It is designed to demonstrate what the modern Royal Navy gets up to, and is accompanied by helicopter, ship and weapons simulators.
Jill Halfpenny's debut.