3D Connexion GNS 530(A) - page 60

GNS 530(A) Pilot’s Guide and Reference 190-00181-00 Rev. E
SECTION 3
NAV PAGES
3-24
The Satellite Status Page also indicates the accuracy of the position fix, using Estimated Position Error (EPE), Dilution
of Precision (DOP), and Horizontal Uncertainty Level (HUL) figures. DOP measures satellite geometry quality (i.e.,
number of satellites received and where they are relative to each other) on a scale from one to ten. 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. HUL is explained in Section 15.
GPS Receiver Status Messages
Searching Sky The GPS receiver is searching the sky for ANY visible satellites. The
pilot is informed of this status with a ‘Searching the Sky’ message.
Acquiring Sat The GPS receiver is acquiring satellites for navigation. In this mode,
the receiver uses satellite orbital data (collected continuously from
the satellites) and last known position to determine which satellites
should be in view.
2D Navigation The GPS receiver is in 2D navigation mode. Altitude data is provided
by an altitude serializer.
3D Navigation The GPS receiver is in 3D navigation mode and computes altitude
using satellite data.
Poor Coverg The GPS receiver cannot acquire sufficient satellites for navigation.
Rcvr Not Usbl The GPS receiver is unusable due to incorrect initialization or
abnormal satellite conditions. Turn the unit off and on again.
AutoLocate The GPS receiver is looking for any available satellite. This process
can take up to five minutes to determine a position.
Table 3-4 GPS Receiver Status Messages