Haiyang Stella Series, Manual

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GPS
Position Fixing Accuracy: HDOP
The GPS fix accuracy is due to the locations of 3 satellites in the sky. High accuracy is obtain
able when the satellites are widely scattered in the sky; on the
contrary, accuracy is reduced when the satellites have gathered in a narrow space. In the follow
ing figure, in both cases it is possible to obtain the GPS fix, but in the left case the accuracy
will be higher than the right:
[HDOP]
The index for position-fixing accuracy is called HDOP ( "Horizontal Dilution Of Precision" ). T
he smaller the HDOP value, the more accurately the position can be fixed.