1, can not search the star at home GPS relies on direct reception of the US GPS satellite signal work, you need to see the sky outside to receive satellite signals, indoor can not receive!

　　2. Short battery life All on-board GPS battery continuous use time is not long, because the car has a cigarette lighter power supply, the designer believes that there is no chance to use the battery for a long time standby, the battery is only standby, not plugged into the power supply continuous use is generally only 40 minutes to 1.5 hours, different models, different use, there will be a big difference. It should be noted that the moment the car is ignited, the starting current is very large, there is a risk of impact burning the car fuse, it is best to start the car, do not plug the car charge in the cigarette lighter, and then connect after starting.

　　3. Positioning is not allowed GPS normal plane positioning error within 10-20 meters, affected by many factors such as weather, the United States GPS policy, and sometimes greater. If the map indicates the location is not very accurate on the road, the reason may be poor signal caused by delay caused by error, it may be the map data occasionally deviation, it may be the road is very wide, so it seems that the GPS is stable offset road surface.

　　4. Can't search for stars or search for stars slowly Do not worry if you can't search for stars or search for stars slowly, please change the location and time to try again. Do not use one or two, or one or two days to decide whether the GPS is good or bad, because the satellite status is different every day, maybe the same place, the signal is full in the morning, but the signal is almost at night.

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