Garmin G1000 Pilot's Manual page 110

AUXILIARY PAGE GROUP
The Satellite Status Page also indicates the accuracy
of the position fix, using Estimated Position Error (EPE)
and Dilution of Precision (DOP) figures. DOP measures
satellite geometry quality (i.e., number of satellites
received and where they are relative to each other) on a
range from 0.0 to 9.9. The lowest numbers are the best
accuracy and the highest numbers are the worst. EPE uses
DOP and other factors to calculate a horizontal position
error, in feet or meters.
8-108 Garmin G1000 MFD Pilot's Guide for the DA40 190-00381-03 Rev. A