BendixKing KMD 540 - Addendum System KMD 850 - Manual (Page 16)

Revision 6 Feb/2009 KMD 550/850 FIS Addendum
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XM WX uses one-way (satellite network to air) broadcast protocol. Data
is continually broadcast without the need to request information, nor
acknowledge receipt.
Both basic (no-cost) and value added fee-based products are transmitted
by VDL. Basic VDL products are displayed using standard ICAO/WMO
textual format.
The VDL ground station network and the XM satellite network repetitively
broadcast the same product until either newer data is available or the
information has exceeded a pre-determined expiration time. Basic prod-
ucts are broadcast at least once every 5 minutes by the VDL system.
Products are broadcast once every 5 - 12 minutes (depending on the
product) by the XM system.
NOTE: Due to inherent delays, areas of coverage and relative age and
availability of the data that can be experienced, weather data cannot
be viewed as an absolute depiction of conditions at a specific location.
Introduction
No-cost VDL Subscription Fee-based XM Subscription
Aviation Routine Weather Reports (METARs) Aviation Routine Weather Reports (METARs)
Aviation Selected Special Weather Reports
(SPECIs) Aviation Selected Special Weather Reports
(SPECIs)
Terminal Area Forecasts (TAFs) Terminal Area Forecasts (TAFs)
Pilot Reports (PIREPs)
AIRMETs AIRMETs
SIGMETs SIGMETs
Convective SIGMETs Convective SIGMETs
Alert Weather Watches (AWW)
Fee-based VDL Subscription
NEXRAD Base Reflectivity NEXRAD Composite Reflectivity
Graphical METARs Graphical METARs
Graphical AIRMETs Graphical AIRMETs
Graphical SIGMETs Graphical SIGMETs
Graphical Convective SIGMETs Graphical Convective SIGMETs
Graphical Alert Weather Watches
Precipitation Type, Freezing Levels, Winds
Aloft, Severe Weather Storm Track SCITs,
Temporary Flight Restrictions TFR's