I have a Virb Elite and have been using it to do videos of lifting in a gym. Since it's indoors I don't care about GPS data, which is invariably going to be hugely inaccurate anyway, but I do care about heart rate data from an Ant+ HRM.
With GPS on you can put that HR data on the screen just fine, but you have to deal with the hugely annoying map that you can't disable. But if you strip the GPS or turn GPS off in the camera (to save battery and so you hopefully don't have to deal with Virb edit's asinine inability to let you turn the map off if you don't care about GPS data or if, as is often the case, the GPS data is bad anyway) you also don't get heart rate data? And you can't import said heart rate data from, say an FR70 because it doesn't have GPS coordinates in it?
This can't be right, can it? You have to let it record GPS data, whether it's relevant or not, and let Virb Edit annoy the living hell out of you with it or you can't have overlays for any kind of data whatsoever?