GDOP (Geometric Dilution of Precision) for GPS Calculations Describes Error Caused by the Relative Position of the GPS Satellites. If the Satellites used in the Calculation are Physically close Together then you have Poor GDOP.

Tags: GPS, GPS Error, GPS Signals, Satellite, GPS Satellite, Satellite Signals, GDOP, DOP, Dilution of Precision, Geometric Dilution of Precision, Poor GDOP