Smart Tracker GPS Vehicle Tracker User Manual page 17

6) Check the parameter setup, whether the device IMEI number, GPRS
sending interval is correct;
9.3 If the device' GPS function is normal, but can not locate for a long time,
please check whether the installation setup of device is correct:
1) Please make sure the GPS antenna face is up;
2) Please make sure there is no electromagnetic wave- absorbent object
(metal) above the device, especially the thermal-protective coating on the
windshield, it may affect the GPS reception of the device;
9.4 If GPS can not receive the signals normally (there is high building around
to interfere with GPS reception), please drive to the open areas for positioning.
Generally, it needs 1-2 minutes to receive the first coordinates.
9.5 If GSM can not receive the signals normally, please check whether SIM
card is installed correctly or there is no GSM signal at the location you are,
such as basement parking, please drive to a place covered by GSM signal
reception.
9.6 When cellphone with special number receives tele- cutoff alarm sms,
please make sure whether it is illegal wire cutoff, or the FUSE on power line is
blown. If the FUSE in it is blown, please contact your distributor to exchange
with the same model FUSE, after the internal trouble is shoot, it can be power
on to work again.