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dire~tion~findinsgta tion.
2) A directi~n~findings tation working alone can only
determine the direction of an aircraft in relation to itself:
6.2.1 Recommendation.- A direction~finding station
working alone should give the following, as requested:
1) true bearing of the aircraft, uusing the appropriate
phrase;
2) true heading to be steered by the aircrqft, with no wind,
to head ,for the direction4nding station using the
appropriate phrase;
3) magnetic bearing of the aircruft, uusing the appropriate
phrase;
4) magnetic heading to be steered by the aircraft with no
wind to make ,for the station, using the appropriate
phrase.
6.2.2 Recommendation.- When dire~tion~finding
statiom work as a network to determine the position of an
aircrqft, the bearings taken by each station should be sent
immediately to the station controlling the directi~n~finding
network to enable the position of the aircrqft to be determined.
6.2.2.1 Recommendation.- The station controlling the
networkshould, on request, give the aircrqft itsposition in one
of the ,following ways:
1) position in relation to a point of reference or in latitude
and longitude, using the appropriate phrase;
2) true bearing of the aircraft in relation to the direction-
,finding station or other spectfied point, using the
appropriate phrase, and its distance from the direction-
,finding station or point, using the appropriate phrase;
3) magnetic heading to steer with no wind, to make,for the
dire~tion~findinsgta tion or other specijed point using
the appropriate phrase, and its distance from the
dire~tion~findinsgta tion or point, using the appropriate
phrase.
6.2.3 Aircraft stations shall normally make requests for
bearings, courses or positions, to the aeronautical station
responsible, or to the station controlling the direction-finding
network.
6.2.4 To request a bearing, heading or position, the
aircraft station shall call the aeronautical station or the
direction-finding control station on the listening frequency.
The aircraft shall then specify the type of service that is
desired by the use of the appropriate phrase.
6.2.5 As soon as the direction-finding station or group of
stations is ready, the station originally called by the aircraft
station shall where necessary request transmission for
direction-finding service and, if necessary, indicate the
frequency to be used by the aircraft station, the number of
times the transmission should be repeated, the duration of the
transmission required or any special transmission requirement.
6.2.5.1 In radiotelephony, an aircraft station which
requests a bearing shall end the transmission by repeating its
call sign. If the transmission has been too short for the
direction-finding station to obtain a bearing, the aircraft shall
give a longer transmission for two periods of approximately
ten seconds, or alternatively provide such other signals as may
be requested by the direction-finding station.
ANNEX 10 - VOLUME I1 6-1 1/11/01
Annex 10 - Aeronautical Telecommunications Volume 11
N o t e . Certain types of VHF/DF stations require the
provision of a modulated signal (voice tvansmission) in order
to take a heaving.
6.2.6 When a direction-finding station is not satisfied with
its observation, it shall request the aircraft station to repeat the
transmission.
6.2.7 When a heading or bearing has been requested, the
direction-finding station shall advise the aircraft station in the
following form:
1) the appropriate phrase;
2) bearing or heading in degrees in relation to the
direction-finding station, sent as three figures;
3) class of bearing;
4) time of observation, if necessary.
6.2.8 When a position has been requested, the directionfinding
control station, after plotting all simultaneous
observations, shall determine the observed position of the
aircraft and shall advise the aircraft station in the following
form:
1) the appropriate phrase;
2) the position;
3) class of position;
4) time of observation.
6.2.9 As soon as the aircraft station has received the
bearing, heading or position, it shall repeat back the message
for confirmation or correction.
6.2.10 When positions are given by bearing or heading
and distance from a Imown point other than the station malung
the report, the reference point shall be an aerodrome, prominent
town or geographic feature. An aerodrome shall be given
in preference to other places. When a large city or town is
used as a reference place, the bearing or heading, and the
distance given shall be measured from its centre.
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