User Guide

Garmin G1000 MFD Pilot’s Guide for the Mooney M20M & M20R 190-00448-00 Rev. A

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AUXILIARY PAGE GROUP

RAIM Prediction

“RAIM” is an acronym for Receiver Autonomous Integ-

rity Monitoring, a GPS receiver function that performs a

consistency check on all tracked satellites. RAIM ensures

that the available satellite geometry will allow the receiver

to calculate a position 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).

During oceanic, en-route, and terminal phases of ﬂight,

RAIM is available nearly 100% of the 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 you with

an alert message when it is not available. If RAIM is not

available when crossing the FAF, the pilot must ﬂy the

missed approach procedure.

The RAIM prediction function also indicates whether

RAIM will be available for a speciﬁed date and time. If

RAIM is not predicted to be available for the ﬁnal ap

proach course, the approach does not become active — as

indicated by an “Approach is not active” message, and a

“RAIM not available from FAF to MAP” message.