It is funny that losing your glasses may be so common. It makes me feel better as I lost my plan-A- glasses while walking on the Camino. I took them off to rest their weight, placed them on the backpack strap hook and lo and behold, when I wanted to put them back, they were gone. Went back on...
I use GaiaGPS app to record my trainings at home. I plan to use it the Camino too. Apparently when you are in Spain you may download the Spain IGN Topo layer that contains the Camino. Not sure how this works yet... Actually, I learn this in this forum in a thread about maps.
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