Hey! This seems like it would be a really lovely and potentially quite emotional journaling experience. I really like having the 3-card spread to work with for each journey, and the extra card for the parting piece is really nice. I have a couple of questions/some feedback :)
1. Is the Major Arcana used for anything? It's not mentioned again after separating the decks, so if not then perhaps including a note to let the player know it's not needed would be reassuring.
If you did want to use the Major Arcana, perhaps it could be used to help identify an aspect of the boat, or the player character themselves?
2. What are the two matching tokens used for?
3. Finally I would suggest to add a coin to the list of things needed to play, in case the player wishes to use the optional mechanic.
I also love the name! Looking forward to the final version :)