NCK

Gps are not working in building or inside room, According to the wiki : "GPS signals are unable to pass through dense materials such as concrete, heavy wood or steel...

You can use tp4056 charger module ouput is 4.2v , A9G module max input voltage is 4.2 v , don't directly connected with 5v to A9G module , VBAT pin...

 recommended power supply design for A9G module,

https://github.com/Ai-Thinker-Open/GPRS_C_SDK/issues/406