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The GNS 480 provides advanced integration of
leading-edge technologies with the following innovative
features:
 | Glideslope guidance for LNAV/VNAV (Gamma 2) and
LPV (Gamma 3) approaches, and advisory vertical
guidance for other non-precision approaches with
vertical path data associated with them
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| Reversionary Modes on the Approach
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| Automatic SUSPend key function
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| New interfaces to Garmin GTX 330/33/320/32 Mode
S/C transponders
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| New interface to display traffic data from L-3
Avionics Systems Skywatch
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| New "NAV" page with a full compass rose CDI
display
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| Flight Planning page enhancements
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| Dual GNS 480 flight plan crossfill capability
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| Ability to calculate RAIM when out of Wide Area
Augmentation System (WAAS) coverage
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| Automatic frequency checking for ILS, backcourse,
and VOR approaches
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| Notification of navigation to non-WGS
84-compliant waypoints in the active flight plan
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| Ability to manually select maximum CDI scaling
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As aviation’s first GPS navigator to feature
precision guidance via WAAS, the GNS 480 now meets the
strictest level of certification for WAAS navigation.
Previously, Instrument Landing System (ILS) availability
was needed for a precision approach in low-visibility
conditions. Now, upon FAA approval, the GNS 480 will
utilize satellite-based navaids for precise lateral and
vertical approach guidance—similar to ILS
operations—without the need for ground-based navaids of
any kind, since avionics certified to Gamma-3
requirements meet the FAA’s standards for
Localizer-equivalent Precision with Vertical (LPV)
guidance.
At the heart of the GNS 480 is a 15-channel WAAS
receiver that updates the aircraft’s position at a rate
of five times per second. Like Garmin’s other integrated
avionics, the GNS 480 provides oceanic-approved IFR
GPS/NAV/COM functionality and ILS/VOR capabilities—but
does so on a 3.8-inch (diagonal), 256-color moving-map
display.
It has the built-in controls for a remote
transponder, such as the GTX 33, Garmin’s new
solid-state Mode S transponder that can be used to
deliver traffic advisories to the GNS 480 via the FAA’s
Traffic Information Service (TIS). With a TIS datalink,
a pilot essentially sees what the ATC sees, including
trend vectors and altitude data of nearby aircraft.
The GNS 480 is also seamlessly integrated to work
specifically with the
MX20
multi-function display (MFD). When coupled with the
MX20, range changes performed on the GNS 480 are
simultaneously refected on the MFD. When the pilot
selects an approach on the GNS 480, the approach plate
is automatically depicted on the MX20 with Jeppesen®
Chart View™. Pilots can also view a vertical profile of
the approach using the MFD’s split-screen capability.
Working in tandem with standard autopilots that
accept roll-steering commands, the GNS 480 behaves like
a high-end flight management system (FMS) by providing
the necessary guidance data to fly the aircraft through
all approach procedures.
- GNS 480 additional
features
| Certification: TSO
C146a, Levels 1, 2, 3 (LPV)
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| FMS operation: Dedicated
buttons and soft-key operation for expanded
functionality
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| "Smart Key" NAV
function: Brings up an HSI-like compass rose with
CDI and vertical deviation indicator (VDI) for
precise lateral and vertical guidance as a backup to
primary instruments during IFR operations
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| VHF COM transceiver: 760
channels and 8-watt transmitting power; standby
frequency monitoring capabilities
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| VHF NAV receiver: 200
channels for VOR, localizer and glideslope
operation; dual-station tracking feature to
cross-check position fixes during approach
procedures
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| Flight planning:
Capacity for 50 flight plans with 150 legs
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| Annunciation: Voice
messaging and audio alerting
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| Power: 11-36 Vdc
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| Interface options:
RS232, RS422, and ARINC 429
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| Aircraft support: STC
Appoved Model List (AML) for more than 700 aircraft
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