.

If Android Qualcomm/Broadcom chip is in a non-GPS coverage location for 60+ minutes while an app is requesting fixes, it goes into sleep

• leaving a device in this state typically flattens the battery within 24 hours

GPS will only resume if during a resume period every 20 to 60 minutes, a fix can be obtained within 3 minutes, ie. excellent GPS coverage

• in urban canyons, this may never happen
• under a viaduct or in-building will never happen
• in a vehicle, typically works

Requesting AGPS update may speed up time-to-fix for Qualcomm but not Broadcom chips. This requires Internet access. Android does not display GPS chip type

A good AGPS app is GPSTest com.android.gpstest.osmdroid

GPS chip operation can largely not be controlled or monitored from Android