Early GPS was always disconnected due to its weak satellite receiving ability. Especially when it was used for navigation in cities, it caused a lot of inconvenience to travel. Later, some civilian GPS chips were developed, which included GPS signals that were not strong enough, thus causing drift. However, under the same circumstances, the earlier GPS products will be completely disconnected until a satellite with strong signal can be found. So this is a contradictory choice, but with the continuous development and upgrading of software and hardware, I believe this situation will become less and less.

　　The most common problem with Xtrac GPS is that the signal will drift (most highly sensitive GPS uses Xtrac technology, GM-270u is). Because it uses the amplification of weak signals for positioning, and the satellite signals are changing at all times, the GPS constantly calculates to correct errors. When the received signals are greatly different from each other, the phenomenon of "drift" will be seen. The navigation software simply receives the signal from GPS and displays the positioning signal on the screen, so it has nothing to do with the signal drift and is purely the GPS receiving positioning error. 2. Moreover, the GPS satellite has an error of 5 to 25 meters. Of course, the design of the map software path locking program is also relevant, but the receiver factor is relatively large. 3. What's more, is your GPS coordinate system the same as the electronic map coordinate system (rarely)

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