Это автор топика и сам может найти: Packet Type: 353 PMTK_API_SET_GNSS_SEARCH_MODE
Support Chip Type: MT3333
Packet Meaning:
This command is used to configure the receive to start searching of which satellite system
Data Field:
PMTK353,GPS_Enabled,GLONASS_Enabled
GPS_Enabled: 0=disable (DO NOT search GPS satellite)
1 or non-ZERO value=search GPS satellite
GLONASS_Enabled: 0=disable (DO NOT search GLONASS satellite)
1 or non-ZERO value=search GLONASS satellite
Example:
$PMTK353,0,1*36<CR><LF> Search GLONASS satellite only
$PMTK353,1,0*36<CR><LF> Search GPS satellite only
$PMTK353,1,1*37<CR><LF> Search GPS and GLONASS satellite only