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GNSS Jamming record is stored in AVL ID 318 parameter and has 3 possible values:
 
GNSS Jamming record is stored in AVL ID 318 parameter and has 3 possible values:
   −
0 - No Jamming,
+
*0 - No Jamming,
   −
1 - Jamming warning status, which means that signal and accuracy is disrupted but device is able to hold GPS fix for at least 5 seconds.
+
*1 - Jamming warning status, which means that signal and accuracy is disrupted but device is able to hold GPS fix for at least 5 seconds.
   −
2 - Jamming critical status, which means that device is not able to acquire GPS fix.
+
*2 - Jamming critical status, which means that device is not able to acquire GPS fix.
    
Worth mentioning, that Jamming Detection can go from any state to any other in 1 second intervals. It is completely dependent on received NMEA data by GNSS receiver. Therefore, it is possible in repeated jamming scenario for the state to rapidly go from 0 to 2 and backwards.
 
Worth mentioning, that Jamming Detection can go from any state to any other in 1 second intervals. It is completely dependent on received NMEA data by GNSS receiver. Therefore, it is possible in repeated jamming scenario for the state to rapidly go from 0 to 2 and backwards.