Final answer:
The indicator of the geometry of the satellites in GPS navigation is PDOP.
Step-by-step explanation:
When navigating using GPS, an indicator of the geometry of the satellites that your receiver is locked onto is PDOP (Position Dilution of Precision). PDOP is a measure of the combined effect of satellite geometry on positioning accuracy. A lower PDOP value indicates better satellite geometry, resulting in more accurate positioning. HDOP (Horizontal Dilution of Precision) and VDOP (Vertical Dilution of Precision) are also indicators of satellite geometry, but they specifically measure the expected error in the horizontal and vertical positioning, respectively.