Endomondo/Strava +iPhone6 +altimeter Does anyone know if these work together? I see there are dedicated iPhone +altimeter apps for the iPhone, but I can't find info if there is an altimeter built into the iPhone that works with these Endomondo/Strava apps.

So my fear is that my gps is not tracking the correct altimeter information. Should I be worried?
GPS may be accurate +/- 15 meteres.
http://gpsinformation.net/main/altitude.htm

If you have a GPS device with barometric measurement - then this can improve.

Should you be worried? If you're using it for cycling then probably not - it is only an indicative figure of metres gained or lost.

If you're trying to land a plane - then yes. :)