The application for these questions is where a GM02SP is installed in a fixed meter that will not move once installed:
Will the Almanac data be retained through a complete power cycle?
If so, will the stored data immediately be used for GNSS as a preliminary location data?
If not, can it be extracted for storage in a non-volatile location and then restored into the chip before the system detects the latest satellite values to create a new Almanac? Being able to assume a location is reasonably valid at power on, reading the meter data, and then storing the latest Almanac data for the next monthly read would be an efficiency improving method for reading fixed meters.
Yes, the assistance data is retained through a power cycle, and the modem will continue to use the stored assistance data as long as it has not expired.
The GM02SP GNSS requires access to assistance files (ephemeris or almanac). The specific files needed depend on the operating mode. These assistance files can be downloaded from a cloud service using the AT+LPGNSSASSISTANCE command.
Once downloaded, the assistance data remains valid for a period (typically about two hours for Ephemeris and six months for Almanac). Depending on the operating mode, the application must verify whether the assistance is still valid before requesting a GNSS fix. This can be checked using AT+LPGNSSASSISTANCE?.
Example:
AT+LPGNSSASSISTANCE?
+LPGNSSASSISTANCE: 0,1,1761,13011378,13011378
+LPGNSSASSISTANCE: 1,1,2080,5106,8706
+LPGNSSASSISTANCE: 2,0,0,0,0
OK
Please refer to the Application notes (Monarch2-GM02SP-GNSSApplicationNote-Rev.2) for details