Up to v 2.6 when the switch was introduced the marker High/Low texture was changed to NAV/GPS and yes when i downloaded v2.7 it displayed NAV/GPS As it did in my win7x32 computer.

When I installed Cap727-100 in this win10 (x64) computer it didn't display and even after many installs and downloads but High/Low, only until last night when I google and found the texture in the free liveries library I downloaded and installed; Call me visual perfectionist, I didn't even test if the switch worked and/if the plane fallowed a GPS course.