GPS drift: normally happens in poor GPS signal or vehicle parking situations, brings wrong coordinates or incorrect speed, triggers false out/in zone alerts, etc.
Solution:
1. Hardware device part: Connect input2 for ACC status detection (All A/S series vehicle GPS tracker input2 wire is default for the ACC status detection)
2. Parameters Configuration, need two commands
Time interval SMS command B03:
000000,B03,X,Y
X is the ACC on time interval, unit is second
Y is the ACC off time interval, unit is second
Eg: 000000,B03,20,100000
When ACC on, data uploads at every 20 seconds interval. When ACC off, data uploads at 100000 seconds interval (almost equal to turn off uploading when ACC off)
Heartbeat interval SMS command S09:
000000,S09,X,Y
X is the ACC on heartbeat interval, unit is second
Y is the ACC off heartbeat interval, unit is second
Eg: 000000,B03,0,300
When ACC on, disable heartbeat uploading. When ACC off, heartbeat uploads at 300 seconds interval.
Why it works?
Heartbeat package without coordinate fields, avoid GPS drift during vehicle parking.
Eg: $$33,866104023192332,36,A10,2,190|46C*6A\r\n
Summary: connect the input2 wire to detect the ACC status, so the device is able to upload the different common/heartbeat package depends on the current ACC ON/OFF status.
