Why the devs left a map out
Unknown Worlds wants players to read their surroundings, learn the silhouette of each biome and route by landmark. The original Subnautica and Below Zero shipped the same way. The PDA, Compass and Beacons are the in-fiction navigation toolkit, and the studio has stated publicly that Subnautica 2 will not add a built-in map.
That choice gives the ocean its sense of scale and dread, but it also makes a community-built map enormously useful. This page is that map.
