Honeywell KMD 250 Pilot's Manual page 122

To receive FIS WX products, an aircraft must be equipped with a com-
patible VDL receiver (KDR 510) or XM receiver (KDR 610), dedicated
VHF antenna or satellite antenna, and appropriate display (KMD 250).
FIS VDL uses a one-way (ground-to-air) broadcast protocol. XM WX
uses one-way (satellite network to air) broadcast protocol. Data is con-
tinually broadcast without the need to request information, nor acknowl-
edge 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.
No-Cost VDL Subscription
Aviation Routine
(METARs)
Aviation Selected Special Weather Reports
(SPECIs)
Terminal Area Forecasts (TAFs)
Pilot Reports (PIREPs)
AIRMETs
SIGMETs
Convective SIGMETs
Alert Weather Watches (AWWs)
Fee-Based VDL Subscriptions
NEXRAD Base Reflectivity
Graphical METARs
Graphical AIRMETs
Graphical SIGMETs
Graphical Convective SIGMETs
Graphical Alert Weather Watches
The VDL ground station network repetitively broadcasts the same
product until either newer data is available or the information has
exceeded a pre-determined expiration time. Basic products are broad-
cast 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.
Rev 4 Aug/2007
Weather Reports
2-3
Fee-Based XM Subscription
Aviation Routine
(METARs)
Aviation Selected Special Weather Reports
(SPECIs)
Terminal Area Forecasts (TAFs)
AIRMETs
SIGMETs
Convective SIGMETs
NEXRAD Composite Reflectivity
Graphical METARs
Graphical AIRMETs
Graphical SIGMETs
Graphical Convective SIGMETs
KMD 250 Pilot's Guide
Introduction
Weather Reports