13
1
）
If the vehicle is in the place where there is no
GPS signal.
2
）
The upside of device should be installed with
face toward the sky.
3
）
The GSM & LTE CAT M1/NB2 and GPS signal
may be weakened if device is installed in the place
with electromagnetic wave absorption material(such
as metal blocks), special attention should be paid if
there is metal thermal insulation layer or heating
layer on the front windshield, so that the position
accuracy will decline, and the severe ones will not
be positioned.
7.4 Position drift
Serious position drift will be found in places where
GPS signal is poor. Please drive the vehicle to the
open places.
7.5 Commands receiving abnormally
1
）
Check the commands format.
2
）
Check if the vehicle is in the places where there
is GSM signal.
3
）
Check if the SIM card is properly installed.
