Why is GPS positioning slow sometimes?

Solution:

GPS start is divided into cold start, warm start and warm start. Cold starts generally occur in the following situations:

1. When the GPS function of the watch is used for the first time.

2. The satellite ephemeris information is lost when the battery of the watch is exhausted and the power is turned off.

3. When the watch is turned off, the displacement exceeds 200 kilometers.

Since the GPS positioning system of the watch needs to download satellite ephemeris information in a cold start state, its positioning time will be much longer than that of a warm start and a warm start. Considering the way the watch is worn and the influence of the arm on the GPS antenna, it is recommended to choose an open field during cold start (including the first positioning), and keep the dial pointing to the sky when the watch is worn normally. Complete the download of ephemeris and GPS cold start positioning. The specific positioning time is related to the weather and surrounding environment.

If the watch does not move too much after the last positioning, and the time interval from the last positioning is less than 2 hours, the watch GPS can be warmed up. In an open field, when the watch is worn normally and the dial points to the sky, the positioning can be completed in about 5 seconds. The exact time depends on the weather and surrounding environment.

When GPS positioning is slow, you can re-open the AP and reconnect the watch to synchronize data, which will greatly improve the GPS positioning speed.