Partial Extract of FAQ (Frequently Anticipated Questions) from the README:
Q: So why does this mod exist?
A: This mod exists because if you piss off each of the factions enough by getting 3 ranks in "Bad" reputation with them, an EXTREMELY high level ship will spawn on the World Map with the express purpose to hunt you down and try to kill you. And some folks want to be able to fight them without having to get the -3 rep with a faction.
Q: Okay, but why would I want to fight these folks then?
A: Because you like the challenge of fighting a level 17 through 20 ship encounter, but don't want to burn your bridges with a faction to do it?
Okay, the REAL reason is that in the case of three of these factions fights (VTC, Huana, Principi), you can get a unique item from those fights, which otherwise is unavailable as even getting a couple of levels of "Good" will lock out these ship battles and their uniques.
So if one wants to get these items without completely pissing off a faction, then this mod is for you.
Plus, as I said, there are folks who like to have more ships to fight on the World Map.
Q: Hey! I'm not always getting a unique item from a fight! What gives?
A: During my testing, I found that occasionally I would not get a unique item I was supposed to during a ship fight. Checking the code, it appears that these items are supposed to drop 100% of the time, so it looks to be either a bug on Obsidian's end or there is something else going on that I can't figure out.
Since I can't find out what is going on here, I would suggest saving your game before engaging with one of the ships that has a unique item as loot and reload the game BEFORE the ship combat started should you not get the item that one is supposed to.
Q: Can I use this mod in a game already started? What versions of the game does this work on?
A: Sure can! Though if this mod gets updated at any point, I can't guarantee that all changes will be applied in an ongoing game, as Deadfire can be a bit finicky about some things when it comes to how ships and NPCs operate.
As for game version, I started testing this on 1.1.1, so it should work there. I have fully tested this on 1.2, and am releasing it with 1.2 as the current version of the game.
Q: So where can I find these ships?
A: You can find the ships in the following areas:
VTC (Estulario Parfitto): Will be circling Maje Island.
Huana (Whenena Eel's Kiss): Will be circling Neketaka Island.
Principi (Arterio the Avenger): Will start off at near the island that has a permanent storm next to it, sail to Dunnage before headding through the the Karatapu Channel near the Oathbiner's Sanctum before heading back to Storm Isand to start its route over again.*
RDC (Hazanui Yaro): Will sail near Sayuka and then stay there.
*NOTE: The Prinicpi ship occasionally seems to stop on the World Map for no apparent reason for a period of time. So it might not be 'on patrol' for some games, but it should be found somewhere roughly in the route described above.
If you have already fought any of these ships for any reason they will not spawn should you install this mod after that point in your game.
Q: Any plans for the future for this mod?
A: Not particularly. One of the reasons why I waited so long to release this is I want to look at most of the angles and only release it when I was fully satisfied with the result.
If I can figure out why the ship captains aren't always dropping the unique item they are supposed to in combat and fix it, I'll update to mod to fix that bug.
Aside from that, I *MIGHT* look into releasing another version of this mod where folks can pick and choose which faction ships to fight, if I can make sure there aren't any conflicts. Mostly though it'll just be squishing any bugs which might pop up and keeping the mod current with the base version of the game.