Very high data usage from "system services"/"time and location" while collecting background GPS traces

Number:rdar://29932063 Date Originated:09-Jan-2017 12:00 PM
Status:Open Resolved:
Product:iOS + SDK Product Version:
Classification: Reproducible:Yes
Core Location

We have users reporting 0.5GB/week of data usage when our app is collecting high-fidelity GPS traces while a user is driving.

Steps to Reproduce:
Use GPS extensively while in the background, note that system "time and location" data usage skyrockets.

Expected Results:
Ideally, collecting GPS routes of drives by users would use far less than 0.5GB/week.

Actual Results:
Data usage is very high while using GPS in the background.

iOS 10.2 (14C92)


iPhone 6+


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