Globalsat Technology GTV-580 - Manual (Page 52)

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L If your car windows equipped with Window Films for
reducing heat and blocking the harmful UV rays, it may
also slightly affect the receiving of GPS signal. Thus, the
cold start time will take longer then usual.
L If the car is moving, it may also affect the time for GPS
fix. We suggest that you stop the car while you turn on
the GTV-580 for a quicker GPS fix time.
L Please avoid excessive heat and humidity. Please do not
leave the GTV-580 in your car under the direct sunshine
with windows closed. Place it in a high temperature
environment may damage its LCD display or the device.