My reaction, if I were the lagging spouse and my spouse was not at the agreed-upon meeting spot would be to:
- honk the horn, 3 beeps at a time; stand on the hood or top of RV to see a greater sweep of the area (I'd assume he had just gone into the bush for toilet reasons)
- uncouple the truck from the RV and make a rapid sweep of the road in both directions, in case s/he was at a different pull-out
- before leaving on this task, I'd open the RV (thieves be damned) and write a note telling him/her to stay put, that I'd be back in 5-10 minutes (and then do a couple of searches up and down the road)
- I'd call 911 within 20 minutes
- If I knew we had been separated for only 10 minutes, I know my spouse's walking rate - he could get almost a mile in that time, so I'd write all that down and I would have already checked the road a mile or two in each direction (and I'd be driving fast)
- Then, I'd be back on foot, retracing the trail and any side trails (there were side trails in this area). I'd honk more before doing that and would be yelling the entire time.
- I'd use markers to indicate the trail I thought was the one we'd taken and where we'd last seen each other; almost anything could be used for this, but if I used things familiar to my spouse, he'd know I had left crumbs if he was actually turned around. I'd use bottled water as one of those markers and stash along the trail and in the area beyond the RV, at side of trail/road
- I'd try and stay to the side of the trail in case others were better at sussing out footprints than I am
BTW, my assumption would be that my spouse did what they said they were going to do (go back to RV). If I got there and the key was still under the rock, I'd assume they couldn't find it (common issue) and that they were in the bush. So I'd be yelling (and using my new whistle). We both know the make, model & color of each others' shoes.
I always check the time when we separate anywhere, and announce it pretty loudly to DH because he loses track of time quickly. I didn't used to wear a watch, but I do now. All the time.
Yes, this is exactly what I'd do if I were the "missing person" in this scenario. You can bet on it. Not able to find key under rock? Yep, right back over to that trail and over to where I last saw hubby, and he would be hearing about it. And yes, the RV itself would be my choice of shade. Which is why, unless she wandered out by that other, smaller trail that headed south and ended up at different dirt pull out (which is the only theory I have that makes sense). If she then assumed she needed to head back to where he was, it would have been at least an additional 2 miles round trip. She could been distracted and easily gotten on that second trail and gone a half a mile or more before realizing she was in the wrong place - but people lose track of time and distance easily out there. Watches are essential, to my way of thinking.
Hubby would never hear the end of the key/rock thing in that case.
You can see the main trail diagonally in the lower right corner, with two spur trails leading toward the dry creek/rock formations. The second one also forms an intersection with a southbound trail (smaller, but still visibly a trail). If she took the spur trail with RT and then left on her own, she might have forgotten they turned and she would have stayed straight (because she was thinking they walked straight the entire time). It's hard to describe. Anyway, you can see that there are other trails and she could have walked back from the truck and not managed to remember which spur trail to turn on - they did search the area where she would have been, as a result, very thoroughly.