190-02177-02 Rev. A
Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
16
SYSTEM OVERVIEW
Figure 1-9 ‘Aux - GPS Status’ Page (RAIM or SBAS Selected)
Satellite Signal
Strength Bars
Satellite Constellation
Diagram
Satellite Signal
Information Status
RAIM
Availability
Prediction
GPS Receiver
Status
EGNOS, MSAS
and WAAS
Selected
RAIM Softkey
Selected
SBAS Softkey Selected
GPS Selection
Softkeys
SATELLITE CONSTELLATION DIAGRAM
The ‘Aux - GPS Status’ Page displays satellites currently in view at their respective positions on a sky view
diagram. The sky view is always in a north-up orientation, with the outer circle representing the horizon, the
inner circle representing 45° above the horizon, and the center point showing the position directly overhead.
Each satellite is represented by an oval containing the satellite identification number. Satellites whose
signals are currently being used are represented by solid ovals.
SATELLITE SIGNAL STATUS
This ‘Satellite Status’ Box provides information regarding signal status. The accuracy of the aircraft’s GPS
fix is calculated using Estimated Position Uncertainty (EPU), Dilution of Precision (DOP), and horizontal and
vertical figures of merit (HFOM and VFOM). EPU is the radius of a circle centered on an estimated horizontal
position in which actual position has 95% probability of laying. EPU is a statistical error indication and not
an actual error measurement.
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, with lower numbers denoting better accuracy. HFOM and VFOM,
measures of horizontal and vertical position uncertainty, are the current 95% confidence horizontal and
vertical accuracy values reported by the GPS receiver.
The current calculated GPS position, time, altitude, ground speed, and track for the aircraft are displayed
below the satellite signal accuracy measurements.