Comment 1 for bug 1488788

I've done a bit of digging.

It appears that if you enable gps tagging once and then disable it, the data is still in the camera app and therefore displayed until one of the following occurs:
1. Camera app is put into the background
2. Camera app is closed
3. Power button tap putting the phone to sleep
4. Phone screen times out.

Once one of the above happens gps is disabled to save battery and the data is missing from the camera app again.