Location sharing on Android

I was trying out the location sharing feature with a friend and ran into problems. We are both running the latest version of DC from the Play Store. The problem is that we could not see each others locations being updated as we were moving around, instead the location of the other person was frozen on the map for both of us.

Is there a setting we missed, is there some GPS location requirement that we missed, or might there be a bug in the code?