15-16
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. N
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
1. While viewing the System page, touch the
Setup
key.
Touch to Set Time
Format And Offset
Touch To Set Up
Com and Nav
Radios
Touch to Enable Crossfill
With Dual GTN Units
Touch to Select
Nearest Airport
Criteria
Touch to Select
CDI And ILS CDI
Capture
Touch to Select
Keyboard
Format
Figure 15-20 System Setup Page
2. After making the desired selections, touch the
Back
key to
return to the Setup page.
15.4.1 CDI Scale Selection
The CDI source and ILS CDI Capture type may be selected manually or
automatically. The selected CDI Scale will be reflected in the annunciation bar at
the bottom of the display.
CDI Scale Selection allows you to define the scale for the course deviation
indicator (both on the GTN unit's on-screen CDI and the external CDI). The
scale values represent full scale deflection for the CDI to either side. The default
setting is “Auto.” At this setting, the CDI scale is set to 2.0 NM during the
“en route” phase of flight. Within 31 NM (terminal area) of your destination
airport, the CDI scale linearly ramps down to 1.0 NM over a distance of 1 NM.
Likewise, when leaving your departure airport the CDI scale is set to 1.0 NM
and gradually ramps up to 2 NM beyond 30 NM (from the departure airport).
During GPS approach operations the CDI scale gradually transitions down to an
angular CDI scale. At 2.0 NM before the final approach fix (FAF), CDI scaling is
tightened from 1.0 NM to the angular full scale deflection (typically the angular
full-scale deflection is 2.0°, but will be as defined for the approach).