GURPS Navigation (Land) and Terrain

[whswhs]

Originally Posted by Tinman

Hills & mountains make great landmarks. I totally see where trees & blocked vision make things hard also featureless terrain like arctic or plains.

I'm not sure that's relevant. If the terrain is "Mountain" that doesn't mean you're looking at a mountain off in the distance; it means you're actually walking through mountains. Mountainous terrain can block your view of the wider landscape, or force you to take non-straight-line paths.