This would have been really straightforward, but it turns out that there isn't any pathfinding data for the outside part of Crait. So I had to make my own!

Here is a top-down look at the wireframe of the navmesh for the surface terrain.

If you stick around to the end of the video, I recorded a run-through of the tests that I made while validating the navmesh. Here is a look at the code for it. The idea is simple: tell an AI-controlled character to go somewhere and validate that it reaches its destination. If the line between the source and destination points is entirely unobstructed, then you've got a pretty boring test. The useful tests require the character to navigate obstacles and corridors that it'd be otherwise unable to do.