No, my fault, I only knew such stuff with real maps up to now.

E.g. a local natural park did something really similar, adding a bunch of plant and animal pictograms to their map as a mini game. You had to count how many you saw. Did really help to not letting the kids get bored during the hike.

And also there is geohashing which is kind of a “roll your destination” game…

Ok, so you don’t do actual hiking, now I think I get the basic idea!

I was propably confused by your “take it on next trip” remark…

Don’t quite get it…

Is it something like geohashing on a physical map?

What are the symbols for? (I guess you didn’t actually encounter 20 bears?)