The nRF9151 Global Navigation Satellite System (GNSS) receiver uses a GNSS almanac file to optimize satellite search and achieve location fix in a shorter period of time. The almanac file is preprogrammed, but it is recommended to be updated to the latest available version to ensure an optimal time for the first fix when GNSS is activated in the end-product.
The %XFILEWRITE AT command can be used to update the almanac file. For more information on the %XFILEWRITE AT command, see Write content to file %XFILEWRITE in nRF91x1 Cellular AT Commands Reference Guide.
The GNSS sample in nRF Connect SDK shows how to use the factory almanac. For more information, see GNSS sample Minimal assistance.