Garmin GNC 420AW GPS Receiver User Manual


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9 - AUX PAGES
170
190-00356-00 Rev E
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
deection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nal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ight
phases call for lower HAL. For example, if the 1.0
NMCDIsettingisselected,full-scaledeection
duringapproachwillstillfollowtheapproachCDI
scale settings.
CDI Scale Horizontal Alarm
Limit
Auto (oceanic) 2.0 NM
±2.0 NM or Auto (en route) 2.0 NM
±1.0 NM or Auto (terminal) 1.0 NM
±0.3 NM or Auto
(approach)
0.3 NM
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:
Oceanic
En Route
Terminal
Approach
Setup 1
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