Crowd Compass

> Crowd Compass creates a mesh network. This means each compass is a relay for information, allowing all Compasses in the area to work together. And one decentralized, self-healing network is created!

They tout a pretty big distance that these things can cover, but it seems like if that's the case, then there wouldn't be a need for a mesh network.

Anyway, this would also be neat for kids. I've often mentioned that it'd be nice to just have a compass that points towards my kid at a busy playground or big park.