User Guide

Garmin G1000 Pilot’s Guide Appendices190-00383-01 Rev. A
C-1
APPENDIX C
QUESTIONS & ANSWERS
This Appendix answers common questions regarding
G1000 system operational capabilities. If a particular
question is not covered in this Appendix, use the index
to find the appropriate section in this manual. If a suf-
ficient answer to a question is not found, please see your
authorized Garmin dealer or contact Garmin directly (see
Copyright page). Garmin is dedicated to supporting its
products and customers.
What is RAIM and how does it affect approach
operations?
RAIM is an acronym for Receiver Autonomous Integ-
rity Monitor. RAIM is a GPS receiver function that does
the following:
• Monitors and verifies integrity and geometry of
tracked GPS satellites.
• Eliminates a corrupt satellite from navigation solu-
tion.
• Notifies the pilot when satellite conditions do
not provide the necessary coverage to support a
certain phase of flight.
• Predicts satellite coverage of a destination area to
determine whether the number of available satel-
lites is sufficient to satisfy requirements.
For RAIM to work correctly, the GPS receiver must
track at least 5 satellites. A minimum of 6 satellites is re
-
quired to allow RAIM to eliminate a single corrupt satellite
from the navigation solution.
RAIM ensures that satellite geometry allows for a navi
-
gation solution calculation within a specified protection
limit (2.0 nautical miles for oceanic and en route, 1.0 nm
for terminal, and 0.3 nm for non-precision approaches).
The G1000 system monitors RAIM and issues an alert
message when RAIM is not available (see Annunciation
and Alerts section). Without RAIM, GPS position accu-
racy cannot be monitored. If RAIM is not available when
crossing the FAF, the pilot must fly the missed approach
procedure.
N OTE: If RAI M is no t pred ict ed t o
be avai la ble fo r the fi na l ap pr oa ch
course, the approach does not become
active, as indicated by the “RAIM not available
from FAF to MAP” message and the INTEG
annunciation flagging.
Why are there not any approaches available for
my flight plan?
Approaches are available for the final destination air-
port in a flight plan or as a direct-to (keep in mind that
some VOR/VORTAC identifiers are similar to airport iden-
tifiers). If a destination airport does not have a published
approach, the G1000 indicates “NONE” for the available
procedures.
What happens when I select an approach? Can I
store a flight plan with an approach, a departure
or an arrival?
When an approach, departure, or arrival is loaded into
the active flight plan, a set of approach, departure or ar-
rival waypoints is inserted into the flight plan – along with
a header line showing the title of the selected instrument
procedure. The original enroute portion of the flight plan
remains active, unless the instrument procedure is acti-
vated. This may be done either when the procedure is
loaded, or at a later time.
Flight plans can also be stored with an approach, a
departure, or an arrival. Note that the active flight plan is
erased when the system is turned off. Also, the active flight
plan is overwritten when another flight plan is activated.
When storing flight plans with an approach, a departure,
or an arrival, the G1000 uses the waypoint information