If the module is not working properly, plz check

①SIM card should be in service

② Switches should in right position

③ The external power supply should be 7-12V@2A

④ Check signal range, best to be on an area with full coverage.

⑤ Signal for GPS has best performance on a clear direct line of sight with sky, even better with less buildings around.

⑥ GPS needs time to connect to at least 4 satellites to output data.

⑦ AT command tester by one of our contributors.