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   Technical information about GPS

    Self test for faulty products
It takes forever to get the signal after coming out of tunnel.
In the normal condition, it takes less than 10 seconds to get the signal again. This can happen usually when the area is not good for the reception, or the map software has bug or it is not installed correctly, or GPS is faulty. If this happen several times, please reinstall the map software or check the receiver. With SysOn viewer program, do a cold start manually and compare the time before it gets fixed signal.
How long does it usually take to get the fixed satellite signal
The time may be different depending on the product and chipset. To check the reception performance, you should check it in the good signal area. In outdoor and no tall buiding or bridge nearby, the GPS usually takes one to two minutes to get the fixed signal. When the unit does a hot start like going into tunnel, it will get the singnal within10 seconds. But this may be affected by landscape, battery state, map software, etc. For the TTFF of Cold start/ Warm start / Hot start, please refer to the technical specification of each product.
Is there any way to check the problem from the externaly?

CF type GPS
When the card gets exceed pressure or bent, the inner board can be damaged. If the card is bent or the connected part of the plastic and the metal is detached, it means the inner board may be broken.


Bluetooth GPS
It is difficult to check from the outside. But high temperature over 50oC can cause the seperation of the components, so it will make a noise when you shake the unit. Or when the unit is swellen, the battery is damaged.


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