Just to clarify... both instances were very far apart... so as far as I can judge, this was NOT the same sub, being re sighted... again, as far as I know...
The 1st was south of Shikoku Island, and the 2nd was well further off to the west of the 1st... separated by many many nautical miles apart... in the magnitude, of roughly 7-800 best guess... best possible estimate was SW of the small string of islands making up an approach way to the South China Sea basin.... as My last orders I got were to patrol area 9 on the designated area on the Nav map...
The 1st subs sighting, was after leaving base & being ordered to go to & await further orders, which came in after attacking that 1st sub, in the same general area as well, before receiving My current orders to patrol, off to the SW of a Korean Island there in area 9.
M. M.
ps:
If need be, I shall see of taking a snap shot & editing it to show approximate sightings of both time of where I was when I tried to attack them.