Read this https://discussions.apple.com/thread/6546079?start=105&tstart=0 people there talked with Apple and got an answer. Location arrow - using M8. If you turn motion data off, everything is going to work, but your walking + running distance may not be AS accurate.
If your battery is draining really fast, talk to Apple, they'll give you link to do a diagnostics test, after that you'll know what to do.
If your battery is draining really fast, talk to Apple, they'll give you link to do a diagnostics test, after that you'll know what to do.