Users only need to have a general understanding of the specific technical indicators of the three generations of chips, and mainly observe whether

　　It has the following characteristics.

　　(1) Fast positioning time: no matter cold start, warm start or hot start, the recapture time is 5-30 seconds faster (compared with the second generation). In fact, most users are not inferior to these ten seconds.

　　(2) High sensitivity: more than 4 satellites can be quickly located and received in high-rise buildings, shade trees, under bridges, shelters, tunnels, windows, vehicles, and even under the chassis of vehicles. It is often said that you can position yourself if you have a little sky (single star positioning), that is, to give a little sunshine is brilliant.

　　(3) Anti interference performance: it can still work normally under the environment of high-voltage line, electric field, magnetic field, high-speed dynamic, microwave, mobile phone and the same frequency interference.

　　(4) Low power consumption and power saving: It reduces power consumption, even has a sleep state (static does not work), which can save power and improve the standby time of the product.

　　(5) Small size, good performance price ratio: small size, light weight, which is the social demand and development trend, can expand more applications and fields. In fact, the price of the third generation chip should be the same as that of the second generation chip, or even lower, but the function of the T-38 (16 channels, third generation) is improved a lot, 200-300 yuan/piece.

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