Garmin G1000 Mooney M20TN - Manual (Page 60)

Garmin G1000 Pilot’s Guide for the Mooney M20M/M20R/M20TN 190-00647-00 Rev. A 2-14
FLIGHT INSTRUMENTS
COURSE DEVIATION INDICATOR
NOTE: If the pilot makes a heading change greater than 105˚ with respect to the course, the CDI on the Arc
HSI switches to the opposite side of the deviation scale and displays reverse sensing.
The Course Deviation Indicator (CDI) moves left or right from the course pointer along a lateral deviation
scale to display aircraft position relative to the course (Figure 2-20).
Figure 2-20 Course Deviation Indicator
CDI
Arc HSI
CDI
360º HSI
The CDI has the same angular limits as a mechanical CDI when coupled to a VOR or LOC. When coupled
to GPS, the full scale limits for the CDI are defined by a GPS-derived distance (5.0, 1.0, or 0.3 nm). The
current GPS CDI scale setting is displayed as ‘System CDI’ on the AUX - System Setup Page, and the scale
setting may also be changed (5.0 nm, 1.0 nm, 0.3 nm, or Auto) from this page (Figure 2-21). When set to
‘Auto’ (default), the CDI scale automatically adjusts to the desired limits based upon the current phase of
flight:
• Leaving the departure airport the CDI scale is set to 1.0 nm and gradually ramps up to 5.0 nm beyond 30
nm from the departure airport
• The CDI scale is set to 5.0 nm during the enroute phase of flight
• Within 30 nm of the destination airport, the CDI scale gradually ramps down to 1.0 nm (terminal area)
• During approach operations, the CDI scale ramps down even further to 0.3 nm. This transition normally
occurs within 2.0 nm of the final approach fix (FAF).
If a lower CDI scale setting is selected (1.0 or 0.3 nm), the higher scale settings are not selected during any
phase of flight and the selected setting is displayed instead of the flight phase annunciation. For example, if
1.0 nm is selected, the G1000 uses this for enroute and terminal phases and ramps down to 0.3 nm during
an approach. Receiver Autonomous Integrity Monitoring (RAIM) protection limits follow the selected CDI
scale and corresponding flight phases.