TM 3-6665-304-10
message will be a series of seven lines, preceded by the phrase "Effective Downwind Message," as follows:
Effective Downwind Message
ZULU
DDtttt (local or ZULU, state which)
ALFA
dddsss
BRAVO
dddsss
Effective Downwind Message
CHARLIE
dddsss
DELTA
dddsss
ECHO
dddsss
FOXTROT
dddsss
c.
The significance of each line is indicated below.
(1) ZULU DDtttt is the date-time at which the winds were measured DD is the day and tttt the hour in local or
ZULU time (GCT).
(2) The remaining lines provide data for the six preselected yield groups, where ddd is the effective downwind
direction in degrees from grid north and sss is the effective windspeed in kilometers per hour.
(a) ALFA dddsss is the data line for the 2kiloton (KT) or less yield group.
(b) BRAVO dddsss is the data line for the over 2-KT to 5-KT yield group.
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