Question 957Navigation General

The correct answer is C) Horizontal Dilution of Precision (HDOP). HDOP is an indicator of the geometry of the satellites that the GPS receiver is locked onto. It measures the quality of the satellite geometry, with a lower HDOP value indicating a better satellite configuration and improved positioning accuracy. HDOP is one of the key factors that determine the overall accuracy of a GPS position fix. The other answer choices are not directly related to the geometry of the satellites. Precision Coding refers to the type of GPS signal, Selective Availability was an intentional degradation of GPS accuracy that has been discontinued, and Doppler Shifting is a phenomenon related to the relative motion between the receiver and the satellites.