I can see where that flat ground could get you turned around without visibility. Never thought about that because in my hills/hollows it is a non-issue if you are the least bit familiar with your location.
Not as good as on a clear night but how impressed was you with your thermals. The first 'fogout' I hunted in, I was using a scanner but still using a gun light to shoot. Called one in after the fog 'dropped' and went to the light but could not see anything but red haze-back to the scanner and it is still there at less than 100yds! Spent the rest of that night hunting ridge tops.
I was using black hot, which resulted in a complete whiteout. I've hunted in over 90% humidity before and could still identify some terrain features and at least determine where the horizon was. However, with the fog and mist, I couldn't see the horizon at all; I could only pick out living heat signatures and the engine of my truck. Before the hunt, we drove around and dropped pins, and I was familiar with some of the setups from having called the spot previously. On one stand, coyotes responded to my vocal from adjacent land that I had access to. We decided to move on those coyotes, I only had satellite imagery to guide us. According to the imagery, I identified an open field that appeared to have a rise, and I noticed a drainage area that I assumed would provide visibility. We stalked out into that field, navigating blindly using only the satellite imagery. We called in a coyote that was circled us, and after gathering it, I became disoriented of the exact direction of the truck.
Here is a map, the arrow on the left indicates where we made our first stand. We set up at the left arrow and killed in three coyotes from the creek to the west. I howled once followed by low-volume whimpers and flycatcher. I alternated between these two sounds, adjusting the volume from mid to low levels. Within 3 to 5 minutes, three coyotes came from the creek. They didn't howl, but two coyotes responded to my vocals across the road to the east, where the green arrows are. I told Chip that we hadn't contaminated the area with sound, so we decided to call this stand, gather the dead and target those coyotes across the road. While I had previously called the first stand, I had never targeted the next area from the west; I had always approached from the north. We parked on the county road running north to south and walked out to the red arrow on the right. It was flat there, and that was where I had the most disorientation. We killed 4 coyotes in this area with very little sound, I will go back and target that area soon.
Sorry I deleted the map it’s got the road names showing my spot locations pin pointed