GPS

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HDOP: In this field the HDOP (horizontal dilution of precision) is displayed. HDOP is a quality indicator for the position of the useable satellites on the local sky. HDOP values less than 4 are very good, HDOP greater than 8 bad.
Precision (x Val): In this field the accuracy (root mean square) of specified number of last measurements is displayed. Filter length can be specified in GPS real time settings.

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