I am currently using FIF in Landscape view as my MiMax (6.5") fits well on my kneeboard in this position.
I also started configuring the "terrain" screen with this orientation.
My first impression is that the size of the different elements is not well balanced: the 6 selectable elements are "giants" with respect to the other elements.
My suggestion would be to allow for displaying 3 columns / 5 rows instead of 2 columns / 3 rows.
This would give a more balanced view while allowing to show more selectable elements in the "terrain" screen.
The two snapshots show the proposal 3x5 and the current implementation 2x3.
You could even consider implementing 4x6 as this would show most of the values using similar having the same sizes.
Thank you in advance for investigating this proposal.