Gents (and Lady)
Something you might want to fix in 2.1...
The environment (sky/ocean) colour maps (TGA's stored in the SkyColorXXX.dat files in data\Env\) are different in the GWX2 16km atmosphere mod to what they are in the default GWX2 (8km) files. See the screeny below for an example.
Scapa Flow Mission, start location, time: 21:56 (looking to port)
8km on left / 16km on right
Personally I think the darker (16km) colours are more realistic