Location time is the time it takes for the receiver to determine its current position when the GPS receiver is restarted. For 20-CHANNEL RECEIVERS, IF YOU ARE NEAR THE LAST LOCATION, THE POSITIONING TIME IS GENERALLY 3 TO 5 MINUTES FOR COLD STARTS AND 15 TO 30 SECONDS FOR HOT STARTS.

　　Note:

　　Cold start: first use; When the ephemeris information is lost due to battery depletion; Move the receiver more than 1000 km in the shutdown state.

　　Hot start: Start less than two hours after the last location.

　　Warm start: Start more than two hours after the last location.

　　Differential GPS (DGPS) is to install a high-precision GPS receiver at a location that is accurately determined to form a base station. The position measurement error or pseudo-range measurement error is obtained by comparing the position measured by the base station receiving the GPS satellite signal with the known position of the station, and the error is broadcast to the surrounding space as the correction value. The GPS user receiver near the base station receives the correction signal from the base station and corrects its GPS measurement value, thus greatly improving the positioning accuracy. Many GPS device providers set up DGPS transmitters in some areas for free use by customers with DGPS-enabled GPS receivers.

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The running track of the gps tracker is an important auxiliary evidence