You could try something like Google My Maps or a FacilMap (a similar tool that's based on OpenStreetMap). Both should be easy enough to set up on tablets, and can be collaboratively edited. Source: about 2 years ago
FacilMap - planning tours collaborative with multiple map sources and elevation profiles. Source: almost 3 years ago
Do you know an article comparing FacilMap to other products?
Suggest a link to a post with product alternatives.
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