Samsung, Palm Micro is the main control chip supplier of GPS products, Palm News, Far Feng, APECco is a chip based on palm micro company to do related application design companies, Metda is a chip based on Samsung company to do related application design companies. At present, there is no design company in the mainland of the program is really perfect, palm news, far front, Apeco's scheme based on the chip of Palm Micro company has the advantage of being cheap, because their scheme eliminates the GPS module, but uses the GPS signal amplifier to do the front-end processing of the GPS signal, and uses the DSP built in the palm micro chip to do the back-end processing of the GPS-related data operation. The machine of this scheme will run a large-capacity map, navigation broadcast delay, and it is easy to stop when other functions are run while navigating. Metda is based on Samsung's chip to do the initial price is more expensive, because the use of GPS module (module has an ARM processor), later they design the program also have some of the GPS module, and the use of palm, far front, Apeco and other companies similar architecture to design. The disadvantage of their scheme is that the power consumption is relatively large when charging, and if the car is charged with the kind of USB head, a 10K,1\/8W resistor should be connected to the 1-4 pins of the USB head inside the charger. Therefore, when the user's USB head car is broken, the charger bought in the electronic city will be prone to automatic crash when in use. Xianxun, Yuanfeng, Apeco provides PCBA shipments, so now many of the GPS purchased on Taobao are the small factories in Shenzhen to directly buy Xianxun, Yuanfeng, Apeco PCBA and related materials assembly. It has not been experimentally tested and aged. Now the use of Metseda Samsung solution products in the domestic brand of God Walker, according to the road line, Canaan, speed Bo met (it is said that because the repair rate is too high to change the name of speed met) and so on.