EITC Corevettes FOUND!!!

[Mantaraya]

Except for flag ships, I think that different ship spawning locations can spawn different types of ships, except that they are always of the same fleet type. So when I'm Corvette hunting (usually around driftwood and rumrunners islands), and I see a Sentinel, I sink it as well, because sometimes they spawn as Corvettes, and sometimes as Sentinels. There are a few spots where Corvettes spawn in that area. There are also a couple spots over by Avaricia.

Also between Port Royal and Cutthroat island.