GoPass AVL-900, User Manual

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5. Does the weather affect GPS operation?
GPS system is able to overcome weather problem in its initial design. GPS
satellite positioning signals consist of short waves; the transmission of short
waves will not be affected by weather conditions. GPS signals may produce
error factors during transmission, such as solar wind, earth rotation, variation of
aerosphere density, building reflection, etc. All of which may cause deviations to
GPS short wave affect signals. But weather factors will not affect the normal
function of GPS.
6. Why can not it monitor?
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Check the microphone connector whether it was connected properly or not.
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Check the memory for SMS messages in the SIM card, to see if it is full or
not.
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Can not receive GSM signal in the place where you locate.