Garmin CNX 80 Pilot's Manual page 110

Basic Operation
Procedures
102
• When an ILS or VOR approach is first selected or executed, the frequency is automatically
checked, if correct. If the frequency is correct, you will not receive a message regarding the
frequency. If the frequency is incorrect, you will receive a message and you must place the ILS
frequency in the active frequency field by pressing the Menu/Enter key when the frequency mes-
sage is received.
• When flying a localizer-based approach (other than backcourse) with automatic CDI
switching enabled:
1. "GPS" guidance may be used while flying outbound and on the initial portion of the procedure
turn.
2. "LOC" guidance is used on the remainder of the approach from the time you turn inbound on
the procedure turn. You will receive a message stating "AUTOSWITCH FROM GPS TO NAV."
3. The localizer frequency must be active to use "LOC" guidance at the MAP. The GNS 480 will
automatically switch back to GPS data for the missed approach.
• When flying a localizer-based approach with automatic CDI switching disabled:
1. You may select "LOC" guidance at any point on the approach prior to reaching the FAF.
2. The localizer frequency must be active to use "LOC" guidance.
Course Transitions Greater Than 270°
For procedures that have heading or course changes in excess of 270 degrees, roll steering will not be available
until you have passed the point where a turn less than 270 degree turn can be accomplished. At this point a
dashed magenta line will show the path to the next leg in the flight plan. You may engage your roll steering
autopilot at this point.
For an example where this might occur, see the Casper, WY (KCPR) departure, ALCOS3, from runway 12.