Hi. I just found all the +240 artifacts, translated all six maps and discovered the correct order of the steps.
But the game doesn't recognize my actions and I can't win the game. The manual says I should get a sign every step acomplished, but I don't get anything (Except my first step, when I enter a required code number, the game emits a sound signal).
Am I missing something? There is simply no walkthrough online...
If anyone wants, I can put here all the info written on the maps.

Finally beat it!!

As I suspected, unfortunately the GOG version is bugged. I presume it's DOS version 3.40.
I discovered there is a 3.50 version, I had to find it on the internet.
With it, I cound make the sequence of codes required to destroy the pirate base.

So there it is, in case someone gets stuck as well.