Garmin GNS 400W Pilot's Manual & Reference page 180

9 - AUX PAGES
Setup 1
more than 500 feet above or below an airspace, you
will not be notified with an alert message; if you are
less than 500 feet above or below an airspace and
projected to enter it, you will be notified with an
alert message. The default is 200 feet.
CDI / Alarms— allows you to define the scale for
the 400W-series unit on-screen course deviation
indicator. 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 of your destination airport, the CDI
scale gradually ramps down to 1.0 NM (termi-
nal area). Likewise, when leaving your departure
airport the CDI scale is set to 1.0 NM and gradu-
ally ramps up to 2 NM beyond 30 NM (from the
departure airport). During approach operations
the CDI scale gradually transitions down to an
angular CDI scale. At 2.0 NM of the final approach
fix (FAF), CDI scaling is tightened from 1.0 to the
angular full scale deflection (typically the angular
full-scale deflection is 2.0°, but will be as defined
for the approach).
If a lower CDI scale setting is selected (i.e., 1.0 or
0.3 NM), the higher scale settings are not selected
during ANY phase of flight. For example, if 1.0 NM
is selected, the 400W-series unit uses this for en
route and terminal phases and ramps down further
during an approach. Note that the Horizontal
Alarm (HAL) protection limits listed below follow
the selected CDI scale, unless corresponding flight
phases call for lower HAL. For example, if the 1.0
NM CDI setting is selected, full-scale deflection
during approach will still follow the approach CDI
scale settings.
170
CDI Scale
Auto (oceanic)
±2.0 NM or Auto (en route)
±1.0 NM or Auto (terminal)
±0.3 NM or Auto
(approach)
An "auto" ILS CDI selection allows the 400W-series
unit to automatically switch the external CDI from
the GPS receiver to the VLOC receiver, when
intercepting the final approach course. Or, select
"manual" to manually switch the external CDI
connection, as needed (using the CDI key). If the
unit is installed with a KAP140/KFC225 autopilot,
automatic switching will not take place. See AUX -
Setup 1 for ILS CDI Selection details.
CDI scales and corresponding Flight Phases:
190-00356-00 Rev G
Horizontal Alarm
Limit
2.0 NM
2.0 NM
1.0 NM
0.3 NM
Oceanic
En Route
Terminal
Approach