I don't have either, but wouldn't mind at all if I did have a GPS. I'm usually going to the same areas I have for years, so know them pretty well and what I'm going to do, where dirt roads go etc. There have been a couple times though out in the desert where it all looks the same and started to get nervous where to find my truck again... would have been handy, LOL.
I have both, I agree that something can go wrong with the electronic device, batteries always die when you don’t have any spares or are using the spares. You must keep up your skill with a map and compass and know how far you have traveled,, has your pace count changed over the last couple of years?
When placing a trail camera don't just look for a well used trail. What you want to do is look for a freshly used trail off by itself that goes from a north facing ridge, thick forest, brushy knob or some other similar bedding area to a food source. Don't forget water sources. Especially in the summer months the deer need water so look for a good trail going down too a creek surrounded by thick cover and place the camera 100 yards up from the water source.
Scent control is very important...