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(b) from 2 to 5 characters, being the coded
designator assigned to an en-route point;
(c) 4 numerics describing latitude in tens and
units of degrees and tens and units of
minutes, followed by “N” (meaning “North”) or
“S” (South), followed by 5 numerics describing
longitude in hundreds, tens and units of
degrees and tens and units of minutes,
followed by “E” (East) or “W” (West). The
correct number of numerics is to be made up,
where necessary, by insertion of zeros, e.g.
“4620N07805W”;
(d) 2 decimal numerics describing latitude in
degrees, followed by “N” (North) or “S”
(South), followed by 3 decimal numerics
describing longitude in degrees, followed by
“E” (East) or “W” (West). Again, the correct
number of numerics is to be made up, where
necessary, by insertion of zeros, e.g.
“46N078W”;
(e) 2 or 3 characters being the coded identification
of a navigation aid (normally a VOR),
followed by 3 decimal numerics giving the
bearing from the point in degrees magnetic
followed by 3 decimal numerics giving the
distance from the point in nautical miles. The
correct number of numerics is to be made up,
where necessary, by insertion of zeros, e.g. a
point at 180° magnetic at a distance of
40 nautical miles from VOR “FOJ” would be
expressed as “FOJ180040”.
The detail of the fields
The elements of data prescribed or permitted
to be included in each type of field, together with a
prescription of the conditions or options permitted,
are shown on pages A3-5 to A3-29.
A key appears at the right-hand side of each
of the field pages; this key permits the sequence of
fields in each type of message to be followed.
On the field pages,
Accuracy in the preparation of ATS messages
Where the standard ATS messages are
transmitted by teletypewriter channels in areas
where ATC computers are known to be in use, the
formats and data conventions prescribed in
the field tables on pages A3-5 to A3-29 shall be
adhered to rigorously.
elements with a fixed number of
characters are shown diagrammatically
as (three characters in this example)
elements of variable length are shown
as
STANDARD ATS MESSAGES AND THEIR COMPOSITION
9 13
13
13
13
13 14
13
13
13
14
13
13
13
13
13
13
15 16
16
16
16
16
16 17
15 18
18 19
9 16
16
16
16
16
16
16
18
15 16
21
3 5 18 19 20
3
3
3
3
3
3 7
7
7
3
3
3
3
3
3 7
7
7
7 8 10
7
7
7
7
7
3
3
3 7
7
7
9
8
8
10
10
Destination aerodrome and total estimated
elapsed time, alternate aerodrome(s)
FIELD TYPE NUMBERS
Supplementary
messages
Coordination
messages
Field flight
plan messages
and associated
update
messages
Emergency
messages
22
22
Amendment
Radio failure information
Alerting search and rescue information
DESIGNATOR
MESSAGE TYPE
Alerting
Radiocommunication
failure
Filed flight plan
Delay
Modification
Flight plan cancelation
Departure
Arrival
Current flight plan
Estimate
Coordination
Acceptance
Logical acknowledgement
message
Request flight plan
Request supplementary
flight plan
Supplementary flight plan
Supplementary information
Other information
Arrival aerodrome and time
Departure aerodrome and time
Route
Estimate data
This field is repeated
as necessary.
This field begins a new line
when the message is printed in
page teletypewriter form.
Not currently used
Not currently used
Not currently used
Not currently used
Not currently used
Equipment
Number and type of aircraft and
wake turbulence category
Flight rules and type of flight
Aircraft identification and SSR Mode
and Code
Not currently used
Description of emergency
Message type, number and
reference data
MESSAGE FIELDS
ALR
RCF
FPL
DLA
CHG
CNL
DEP
ARR
CPL
EST
CDN
ACP
LAM
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