This is the first thing I haven't really liked...
1) It just looks like a feat chain which I got way burned out on on PF1
2) The potential overlap with signature skills and weapon proficiencies bugs me - do you just lose all benefit?
3) It seems way too situational, like you would never really take it... all the 'on a boat' stuff
4) I don't like not being able to take the archetype until level 2
YMMV but not liking this