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190-00498-07 Rev. A
Garmin G1000 Pilot’s Guide for Cessna Nav III
27
SYSTEM OVERVIEW
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICES INDEX
The GPS solution type (ACQUIRING, 2D NAV, 2D DIFF NAV, 3D NAV, 3D DIFF NAV) for the active GPS
receiver (GPS1 or GPS2) is shown in the upper right of the GPS Status Page. When the receiver is in the process
of acquiring enough satellite signals for navigation, the receiver uses satellite orbital data (collected continuously
from the satellites) and last known position to determine the satellites that should be in view. ACQUIRING is
indicated as the solution until a sufficient number of satellites have been acquired for computing a solution.
When the receiver is in the process of acquiring a 3D navigational GPS solution, 3D NAV is indicated as the
solution until the 3D differential fix has finished acquisition. SBAS (Satellite-Based Augmentation System)
indicates INACTIVE. When acquisition is complete, the solution status indicates 3D DIFF NAV and SBAS
indicates ACTIVE.
•RAIM(ReceiverAutonomousIntegrityMonitoring)Prediction(RAIM Softkey is selected)
In most cases performing a RAIM prediction is not necessary. However, in some cases, the selected approach
may be outside the SBAS coverage area and it may be necessary to perform a RAIM prediction for the intended
approach.
Receiver Autonomous Integrity Monitoring (RAIM) is a GPS receiver function that performs a consistency
check on all tracked satellites. RAIM ensures that the available satellite geometry allows the receiver to calculate
a position within a specified RAIM protection limit (2.0 nautical miles for oceanic and enroute, 1.0 nm for
terminal, and 0.3 nm for non-precision approaches). During oceanic, enroute, and terminal phases of flight,
RAIM is available nearly 100% of the time.
The RAIM prediction function also indicates whether RAIM is available at a specified date and time. RAIM
computations predict satellite coverage within ±15 min of the specified arrival date and time.
Because of the tighter protection limit on approaches, there may be times when RAIM is not available. The
G1000 automatically monitors RAIM and warns with an alert message when it is not available. If RAIM is not
predicted to be available for the final approach course, the approach does not become active, as indicated by the
messages “Approach is not active” and “RAIM not available from FAF to MAP”. If RAIM is not available when
crossing the FAF, the missed approach procedure must be flown.
Predicting RAIM availability
1) Select the GPS Status Page.
2) If necessary, press the RAIM Softkey.
3) Press the
FMS
Knob
. The ‘WAYPOINT’ field is highlighted.
4) Turn the small FMS Knob to display the Waypoint Information Window.
5) Enter the desired waypoint:
a) Use the FMS Knob to enter the desired waypoint by identifier, facility, or city name and press the ENT Key. Refer
to Section 1.7 for instructions on entering alphanumeric data into the G1000.
Or:
a) Use the large FMS Knob to scroll to the Most Recent Waypoints List.
b) Use the small FMS Knob to highlight the desired waypoint in the list and press the ENT Key. The G1000
automatically fills in the identifier, facility, and city fields with the information for the selected waypoint.
c) Press the ENT Key to accept the waypoint entry.