Please help!!

[Maximvs]

Well, I have seen Corvettes in the following locations:

Behind Rums - it rotates though with a Setinel (Light EITC Gal) and the occasional higher Navy ship - so you may not find one there (unless you sink the Setinel or other nearby Navy, then it may come up in rotation next).

See one just off Cutthroat this morning (non-flagged), donno where it caome from though. Also see the odd one behind Cuba towards Tormenta, but once again its an on-off scenario.

The Corvette Flagship starts at Kingshead, sails behind Cutthroat and over to Outcast Isle, then turns around and sails all the way back. Keep in mind being a 'flaggie' you have to cripple and board it (usually 3 dudes Level 7 to 14) to get the credit of this ship.