CAP 413 Radiotelephony Manual
Chapter 4 Page 36
5.5 Offshore Communication Service
5.5.1 Introduction
Aeronautical radio stations located offshore on rigs, platforms and vessels provide an
air-ground service to helicopters operating in the vicinity.
5.5.2 Offshore Station Identification
Offshore radio stations must identify themselves using the callsign specified by the
CAA in the approval document. No suffix will be added to the CAA approved callsign
when traffic information is to be passed by the operator of the aeronautical radio
station. When logistics information is to be passed the suffix 'LOG' shall be added to
the approved callsign.
5.5.3 Offshore Phraseology
Actual communications will follow a pattern dictated by the individual circumstances.
However, in the interests of conformity and to avoid misunderstandings, a selection
is given of the types of messages a helicopter pilot may pass, their meaning where
necessary and the response which should be made.
Table 4
Helicopter Response
(Offshore station callsign) (Aircraft
callsign) Take the Flight Watch (You
are requested to maintain radio
watch until watch is taken by
another station)
(Aircraft callsign) (Offshore station callsign) I have
the Flight Watch
(Offshore station callsign) (Aircraft
callsign) position …
(Aircraft callsign) (Offshore station callsign) Roger
(Offshore station callsign) (Aircraft
callsign) Report your weather
(Aircraft callsign) (Offshore station callsign) Weather
(State the following information as appropriate)
Surface Wind (number) degrees (number) knots,
Visibility (distance) kilometres/metres,
Weather (rain, snow, showers, etc.),
Cloud few/scattered etc., (number) feet estimated,
Ambient temperature (number),
Helideck temperature (number),
(Name of Area) QNH (pressure) (hectopascals),
QFE (pressure) (hectopascals),
Pitch (number) degrees: Roll (number) degrees:
Heave (number) metres (as appropriate)
(Offshore station callsign) (Aircraft
callsign) Switch on the NDB
(Aircraft callsign) (Offshore station callsign) Wilco
NDB frequency (number) kHz ident (letters) (if
requested)
(Offshore station callsign) (Aircraft
callsign) ETA is (time)
(Aircraft callsign) (Offshore station callsign) Roger
(Offshore station callsign) (Aircraft
callsign) Landing in (number) minutes
(Aircraft callsign) (Offshore station callsign) Roger
(Offshore station callsign) (Aircraft
callsign) overhead
(Aircraft callsign) (Offshore station callsign) Roger
17 November 2011
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