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This remember me the (paper) maps where you can scratch the places you've been.

I like the idea, and I think you can do a lot more of stuff than you can do now with "just" gamification.

Do you have any specific ideas in mind?

Sure, just sent you an email ;-)

I liked the idea a lot. However I won't use it because it will waste my battery.

Probably will make me sad also, reminding me that I almost never leave my town.

I originally intended to only do the visualisation part but the problem is that I somehow need to get a list of geocoordinates that a person previously visited...

This sounds like a cool idea! I think it's a shame it's not scalable on the iPhone. :(

What do you mean by 'scalable'?

Show HN: Hero Map – Covering the world in a fog of war to encourage exploration