In the past, due to the weak ability to collect satellites, the early GPS always had a disconnection, especially when it was used for navigation in the city, which caused a lot of inconvenience to travel. Some civilian GPS chips developed later included GPS signals with insufficient signals, which caused the phenomenon of drift. But in the same situation, the older GPS products will be completely disconnected, and will not start accepting until a satellite with a strong enough signal can be found. So this is a relatively contradictory choice, but with the continuous development and upgrading of software and hardware, I believe this situation will become less and less.

　　Signal drift is the most common problem of GPS with Xtrac technology (most high-sensitivity GPS uses Xtrac technology, GM-270u is), because it uses amplifying weak signals to calculate for positioning, and satellite signals are always changing. , so the GPS continuously calculates to correct the error. When the received signal is very different before and after, you will see the phenomenon of "drift". The navigation software simply receives the signal from the GPS and displays the positioning signal on the screen, so it has nothing to do with the signal drift, it is purely the GPS positioning error. 2. Furthermore, the GPS satellite number has an error of 5 to 25 meters. Of course, the map software is also related to the road-locking design, but the receiver factor is relatively large. 3. Then, is the coordinate system used by your GPS and the coordinate system of the electronic map the same (rarely)

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In addition to seeing if the GPS is accurate, please also pay attention to the GPS radiation