We have different definitions on ‘sea’.

sea (noun)

The salt water that covers most of the earth’s surface and surrounds its continents and islands.

This is a definition from Oxford Learner’s Dictionaries.

The sea is a giant plain of waves with himself standing on a surfboard moving around.

This is probably how he defines it.

For me, the sea is a network of coordinates, where I can navigate my ship.

Anyway, we have the same interest.

We are heading out to it.

L.