There is a quote somewhere that goes:
"I have never been lost, just a mite confused for a couple days." I am sure I got the quote wrong, and I don't know who said it.

There have been many times when I didn't know exactly where I was... but I did know what valley I was in, or looking into.

If your or your wife are worried about it.. you can get a gps. Just get the cheapest etrex and only use it to find coordinates. If you only turn it on to find coordinates every day or so, the batteries last a long time. And, the cheapest etrex is around $80 on amazon. That is how I use my etrex 10. I print off topos with UTM grid coordinates, and follow the maps exclusively. And, whenever I need to, I turn on the gps and get the UTM grid coordinate and find it on my map.

Of course, I doubt you need a gps. You have already hiked a LOT without one. And, I can't think of a better activity than wandering around the mountains with my wife, lost or not.