Submersible Information Thread

[Flanny]

@Flanny How do you access the nautical maps menu? Was that an item dropped from voyage that you had to use from inventory to unlock, did a voyage unlock the new menu w/o using item, was it just there?

I got the nautical map from Sunken Vault, after which selecting voyage brings up the nautical map menu before letting you select sectors. I forgot to mention that in my excitement.
Discovering one sector in the new map unlocked it.