Ahoy..
Whilst on My 10th patrol, patrolling just off Lingyaen (sp?) Gulf, off to the NNW of Manilla, best guess... ran across a ship, sitting stationary.
Tender Heian (snap attached of it complete with lat/long coords in the ships sunk log).
Dunno if this was 1 of those ships you found & corrected or not.. if not, then will need to check into it then...
End Report.
M. M.