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6.2.1 1 When the position is expressed in latitude and
longitude, groups of figures for degrees and minutes shall be
used followed by the letter N or S for latitude and the letter E
or W for longitude, respectively. In radiotelephony the words
NORTH, SOUTH, EAST or WEST shall be used.
6.2.12 According to the estimate by the direction-finding
station of the accuracy of the observations, bearings and
positions shall be classified as follows:
Bearings:
Class A - accurate within plus or minus 2 degrees;
Class B - accurate within plus or minus 5 degrees;
Class C - accurate within plus or minus 10 degrees;
Class D - accuracy less than Class C.
Positions:
Class A - accurate within 9.3 lun (5 NM);
Class B - accurate within 37 Icm (20 NM);
Class C - accurate within 92 l m (50 NM);
Class D - accuracy less than Class C.
6.2.13 Direction-finding stations shall have authority to
refuse to give bearings, heading or positions when conditions
are unsatisfactory or when bearings do not fall within the
calibrated limits of the station, stating the reason at the time of
refusal.
CHAPTER 7. AERONAUTICAL BROADCASTING SERVICE
7.1 General
7.1.1 Broadcast material
The text of broadcast material shall be prepared by the
originator in the form desired for transmission.
7.1.2 Frequencies and schedules
7.1.2.1 Broadcasts shall be made on specified frequencies
and at specified times.
7.1.2.2 Schedules and frequencies of all broadcasts shall
be publicized in appropriate documents. Any change in
frequencies or times shall be publicized by NOTAM at least
two weeks in advance of the change." Additionally, any such
change shall, if practicable, be announced on all regular
broadcasts for 48 hours preceding the change and shall be
transmitted once at the beginning and once at the end of each
broadcast.
* N o t e . This does not prevent an emergency change of
frequency when required in circumstances which do not permit
the promulgation of a NOTAM at least two weeks in advance
of the change.
7.1.2.3 Scheduled broadcasts (other than sequential
collective type broadcasts), shall be started at the scheduled
time by the general call. If a broadcast must be delayed, a short
notice shall be transmitted at the scheduled time advising
recipients to "stand by" and stating the approximate number of
minutes of delay.
7.1.2.3.1 After definite advice has been given to stand by
for a certain period, the broadcast shall not be started until the
end of the standby period.
7.1.2.4 Where broadcasts are conducted on a timeallotment
basis, transmission shall be terminated by each
station promptly at the end of the allotted time period whether
or not transmission of all material has been completed.
7.1.2.4.1 In sequential collective type broadcasts each
station shall be ready to commence its broadcasts at the
designated time. If for any reason a station does not
commence its broadcast at the designated time, the station
immediately following in sequence shall wait and then
commence its broadcast at its own designated time.
7.1.3 Interruption of service
In the event of interruption of service at the station responsible
for a broadcast, the broadcast shall, if possible, be made by
another station until normal service is resumed. If this is not
possible, and the broadcast is of the type intended for
interception by fixed stations, the stations which are required
to copy the broadcasts shall continue to listen on the specified
frequencies until normal service is resumed.
7.2 Radiotelephone broadcast
procedures
7.2.1 Broadcast technique
7.2.1.1 Transmissions by radiotelephone shall be as
natural, short and concise as practicable consistent with clarity.
7.2.1.2 Rate of speech on radiotelephone broadcasts shall
not exceed 100 words per minute.
7.2.2 Preamble of the general call
The preamble of each radiotelephone broadcast shall consist of
the general call, station name, and optionally the time of
broadcast (UTC).
N o t e . Thefollowing example illustrates the application of
this procedure:
(general callj ALL STATIONS
(the wordLT~H IS IS) THIS IS
(station name) NEW YORK RADIO
(time of broadcast) TIME, ZERO ZERO FOUR FIVE
ANNEX 10 - VOLUME I1
CHAPTER 8. AERONAUTICAL MOBILE SERVICE -
DATA LINK COMMUNICATIONS
8.1 General 8.1.1.3 Roman numerals shall not be employed. If the
originator of a message wishes the addressee to be informed
Note 1 . While the provisions of Chapter 8 are based that Roman figures are intended, the Arabic figure or figures
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