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areas of fringe coverage however, care should be taken to maintain a SELCAL watch on HF thus ensuring
that if VHF contact is lost the aeradio station is still able to contact the aircraft. It is important for the pilot to
appreciate that when using GP/VHF, these communications are with an aeradio station and the pilot is not in
direct contact with ATC. However Direct Controller/Pilot Communications (DCPC) can be arranged, if
necessary, via patch-through on some GP/VHF frequencies.
6.1.12 Reykjavik centre operates several Direct Controller Pilot Communications (DCPC) VHF
stations providing coverage to approximately 250 NM from the coast of Iceland and Faroes. Those stations
are used to provide tactical procedural control and radar control within the South and East sectors of the
Reykjavik area. The callsign of the Reykjavik centre is “Reykjavik control” or just “Reykjavik” and
indicates that the pilot is communicating directly with an air traffic controller. The callsign of Iceland radio
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 6
NAT MNPS 29 Edition 2009
is “Iceland radio” or just “Iceland” and indicates that the pilot is communicating with a radio operator who
is relaying messages between the pilot and the appropriate control facility.
6.1.13 The carriage of HF communications equipment is mandatory for flight in the Shanwick
OCA. Aircraft with only functioning VHF communications equipment should plan their route outside the
Shanwick OCA and ensure that they remain within VHF coverage of appropriate ground stations throughout
the flight.. Details of communication requirements are published in State AIPs and ICAO publications.
SATCOM Voice Communications
6.1.14 Following successful trials, SATCOM ATS air/ground voice may now be used for any
routine, non-routine or emergency communications throughout the NAT Region. State AIPs contain the
necessary telephone numbers and/or short-codes for air-initiated call access to aeradio stations and/or direct
to OACs. Since oceanic traffic typically communicate with ATC through aeradio facilities, a SATCOM call
made due to unforeseen inability to communicate by other means should be made to such a facility rather
than the ATC Centre, unless the urgency of the communication dictates otherwise. Operators are, of course,
also bound by their own State of Registry‟s regulations regarding carriage and use of any and all long-range
ATS communications equipment. In many instances MMEL remarks for HF systems now provide
significant relief for SATCOM equipped aircraft, thereby making the requirement for the carriage of fully
serviceable/redundant HF communications equipment much less of an issue (Reference HF Communications
Failure). Pilots electing to use SATCOM voice as an alternative to HF voice communications remain
responsible for operating SELCAL or maintaining a listening watch on the assigned HF frequency.
Datalink Communications
6.1.15 Datalink communications are gradually being introduced into the NAT environment for
position reporting ( via FANS 1/A ADS & CPDLC and also via FMC WPR through ACARS) and for other
air/ground ATS exchanges (using FANS 1/A CPDLC). Guidance Material containing full details of the
various services and operational procedures can be downloaded from http://www.paris.icao.int/. AIS
publications of the NAT ATS Provider States should be consulted to determine the extent of current
implementation in each of the North Atlantic OCAs
6.1.16 On first contact with the initial aeradio stations crews of participating aircraft should expect
to receive the instruction “VOICE POSITION REPORTS NOT REQUIRED”.
6.2 INTER-PILOT AIR-TO-AIR VHF FACILITY 123.45 MHz and EMERGENCY
FREQUENCY 121.5 MHz
6.2.1 The frequency 121.5 MHz should be continuously monitored by all aircraft operating in the
NAT Region so as to be prepared to offer assistance to any other aircraft advising an emergency situation.
6.2.2 An air-to-air VHF frequency has been established for world-wide use when aircraft are out
of range of VHF ground stations which utilise the same or adjacent frequencies. This frequency, 123.45
MHz, is intended for pilot-to-pilot exchanges of operationally significant information (N.B. It is not to be
used as a “chat” frequency).
6.2.3 123.45 MHz may be used to relay position reports via another aircraft in the event of an airground
communications failure.
6.2.4 This frequency (123.45 MHz) may also be used by pilots to contact other aircraft when
needing to coordinate offsets required in the application of the Strategic Lateral Offset Procedures (SLOP).
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 6
NAT MNPS 30 Edition 2009
6.2.5 If necessary initial contact for relays or offset coordination can be established on 121.5 MHz
　
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