So I have an errand at a location I'm not familiar with, and I look it up on Google Maps, and I send it to my phone, and Google Maps on my phone gives me this direction:
You are (were) at 9% battery. I'd bet that your phone went into power-save mode and turned off location services to conserve battery.
Looks pretty straightforward to me; simply a clear graphic version of Horace Greeley's sage advice!
Craig