It's just an example.

Open your desired TGA with Gimp and color the areas.
There may be a steel colored rectangle, or a brown colored circle, or whatever...
You don't know what it's good for, but if you color them in pink and purple and reinsert the changed TGA into the game, you will see the pink and purple areas representing the changed areas of your TGA.

Use S3D to save an image of where the textures are for each part.
It's a UV map that shows you where to 'paint'.
Just know this.
Some parts use the same areas all over the place.
The Hull being a great example.

Deckgun TGA is in Guns.dat in ...Ubisoft\SilentHunterIII\data\Library

Thanks for the info Gentlemen :salute: