Garmin gnc 420 User Guide
GNC 420/420A Pilot’s Guide and Reference
11-11
SECTION 11
ADDITIONAL FEATURES
11.2 WEATHER DATA LINK INTERFACE
This section is written for:
• Garmin GNC 420/420A Main System Software
Version 5.01
• GDL 49 Main Software Version 2.03
• GDL 69/69A Main Software Version 2.14
• GDL 69/69A Main Software Version 2.14
Some differences in operation may be observed when
comparing the information in this manual to earlier or
later software versions.
later software versions.
NOTE: This section is written exclusively for
GNC 420 units that are configured with the GDL
49 or GDL 69(A) Data Link Satellite Receiver.
Refer to the 400/500 Series Display Interfaces
Pilot’s Guide Addendum (190-00140-10) when
interfacing with non-Garmin products.
GNC 420 units that are configured with the GDL
49 or GDL 69(A) Data Link Satellite Receiver.
Refer to the 400/500 Series Display Interfaces
Pilot’s Guide Addendum (190-00140-10) when
interfacing with non-Garmin products.
Introduction
The GNC 420 unit provides the display and control
interface for the textual and graphical weather data
link. For the GDL 49, satellite up-linked textual and
graphical weather data is received on a request/reply basis.
Transmissions are made using bursts of compressed data
at a rate of 4800 bps.
link. For the GDL 49, satellite up-linked textual and
graphical weather data is received on a request/reply basis.
Transmissions are made using bursts of compressed data
at a rate of 4800 bps.
With the addition of software version 4.03 and 5.03,
GNC 420 units can now interface with the GDL 69/69A.
Weather data transmissions are streamed directly to the
unit from the XM Satellite Radio network. Operational
differences are noted between the GDL 69/69A and the
GDL 49.
Weather data transmissions are streamed directly to the
unit from the XM Satellite Radio network. Operational
differences are noted between the GDL 69/69A and the
GDL 49.
• GDL 49 - NEXRAD and METAR data is collected
by the National Weather Service and disseminated
to Meteorlogix™, a weather information provider.
This data is then delivered to a weather server
in the Echo Flight Message System. With
the weather data on the system, an incoming
customer request is filled, logged, and turned
to Meteorlogix™, a weather information provider.
This data is then delivered to a weather server
in the Echo Flight Message System. With
the weather data on the system, an incoming
customer request is filled, logged, and turned
around for delivery to ORBCOMM in less than
five seconds (ORBCOMM is a provider of global
messaging services using a constellation of 26
low-Earth orbiting satellites). The message is
relayed from the satellites to the GDL 49 aboard
the aircraft. Once the GDL 49 receives the
message, it is displayed on the GNC 420 unit.
five seconds (ORBCOMM is a provider of global
messaging services using a constellation of 26
low-Earth orbiting satellites). The message is
relayed from the satellites to the GDL 49 aboard
the aircraft. Once the GDL 49 receives the
message, it is displayed on the GNC 420 unit.
• GDL 69/69A - NEXRAD and METAR data
is collected by the National Weather Service
and disseminated to WxWorks™, a weather
information provider. This data is then delivered
to XM Satellite for rebroadcast. Data from two
XM satellites is then made immediately available
to XM customers. The GDL 69/69A receives
streaming weather data, processes the data, then
sends it to the GNC 420 unit for display.
and disseminated to WxWorks™, a weather
information provider. This data is then delivered
to XM Satellite for rebroadcast. Data from two
XM satellites is then made immediately available
to XM customers. The GDL 69/69A receives
streaming weather data, processes the data, then
sends it to the GNC 420 unit for display.
Functions provided by the Weather Data Link system
include:
• Request for and display of NEXRAD radar
imagery.
• Request for and display of text-based METAR
data.
• Request for and display of a compressed form of
METAR data that allows icon representations at
reporting stations on a moving map indicating
visibility, ceiling, etc.
reporting stations on a moving map indicating
visibility, ceiling, etc.
• Position tracking services are provided through
periodic position report transmissions from the
GNC 420 unit (available with GDL 49 only).
GNC 420 unit (available with GDL 49 only).