Probably Michael Cain as the lead role, but I am not sure of that.  The Pirates indoctrinate his son.  The Pirates eventually take control of a Coast Guard Cutter.  Then the lead character (Michael Cain???) discovers an unattended M2, swipes off the cover and takes his revenge in bloody and vegetable spraying glory.

What was the name of this film? As I remember it wasn't that great until the end, and the ending was beyond fantastic.  Full revenge.

Yes I have looked on IMDB with Michael Cain and I haven't been able to narrow it down.

Thank you for you time and patience.  Your relevant comments are welcomed and encouraged.

Michael Caine not Cain


http://www.imdb.com/title/tt0080934/


And:


Plot synopsis

Blair Maynard (Michael Caine) is a British-born American journalist who was once in the Navy and decides to investigate the mystery of why so many boats disappear in the Bermuda Triangle of the Caribbean. He takes his estranged son Justin (Jeffrey Frank) with him to the area on the "vacation" and, while fishing, both are attacked by an unkempt man and forcibly brought to an uncharted island. On the island, Blair discovers the terrible truth: the inhabitants on the island are actually a centuries-old colony of savage French pirates.

The group has been living on the island for centuries, unseen by society, who sustain themselves by raiding pleasure boats. The pirates kill whomever comes to the island, however, Blair and his son are both kept alive due to a false assumption regarding their lineage and a need to offset the negative effects of inbreeding. Blair is used to impregnate a female (Angela Punch McGregor) and act as a scribe for the largely illiterate group, while Justin is brainwashed to become a surrogate heir to Nau, the pirate leader (David Warner). Blair struggles to escape from the island, but all attempts fail.

With Blair having begun his captivity as a very peaceable, civilized, and modern everyman, he is helpless in the absence of law and the presence of almost unlimited violence the pirates commit regularly. Subjecting him to constant fear and abuse, culminating in the pirates brainwashing his son to become the new surrogate heir to the colony, the pirates completely fail to realize how desperate and as a result, dangerous, Blair is becoming as his repeated escape attempts continually fail. He eventually arranges for them to come head to head with a US Coast Guard ship, but through their almost unimaginable savagery, they manage to wipe out the crew and take over the vessel. Blair sneaks aboard and, while most of the pirates are gathered on the aft deck of the ship, examining their loot, he discovers a deck-mounted .50 caliber M2 Machine Gun hidden underneath a tarp. He knows that this is his one chance to save both his and Justin's lives and he does not hesitate to flip off the tarp and open fire on the pirates, killing perhaps forty to fifty men within seconds. He continues to fire even after they are all dead while evincing nothing but savage delight and satisfaction.

He then learns that Nau, by far the most dangerous and intelligent of them, was not on the deck. The two men then stalk each other through various parts of the decimated coast guard vessel. Blair eventually gets the upper hand and kills Nau with a flare gun, again proving how dangerous even the meekest of men can be when pushed too far. Blair and his son, who no longer desires to be a pirate and seems much more respectful of his father, are reunited.


https://en.wikipedia.org/wiki/The_Island_(1980_film)

The Island?

Heat?

Nevermind, I just found it.  The Island.

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Saw it in the theatre.

Tu Barb

I now want to see this

Interesting that they took Nau as the name of the pirate leader. Probably one of the most disgusting and ruthless pirates of the 17th Century had that name, although he was popularly known as "L'Ollonais."

Most pirate stuff like the plank are bullshit, but Nau was a dude who did things like the time he literally ate captive's hearts in front of other captives to encourage them to talk. As you can imagine, he met a bad end.

Nevermind, I just found it.  The Island.

Sounds like Captain Ron!

Remember when they shot Billy Zane in the face with a flare gun in Dead Calm?

Good times.

As a young lad, I loved that ending.

Is that the movie where Billy Bad Ass the passenger does a kung fu routine on deck and one of the pirates just draws his pistol and shoots him dead in an instant?

Chris

Especially awesome when the kid goes all pirate an shit.

Saw it in the theater. I hated that kid.

I could be wrong, but as I remember the Billy Bad Ass passenger does really well for himself until they call on their local swordsman, who cuts him down quickly.