The third part of this walkthrough covering Steller Basin
1:49 castaway location bring back to lesser marrow
2:00 first map piece (you dont need the map just go to the location for loot)
2:23 Fish shrine location (need hammerhead, Bronze Whaler, Black Tip reef shark, and ghost shark)
2:51 treasure map pieces lead you
3:51 2nd map piece location
3:58 final map piece location
4:18 dog location bring back to Researcher
13:50 ghost shark location in case your having trouble finding one