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implementation in each of the North Atlantic OCAs. N.B. The first such datalink initiative in the North
Atlantic Region, Centralised ADS (CADS) was phased out on 31 May 2005. From that date aircraft
intending to provide ADS position reports must logon specifically to the initial OAC and additionally the
crews are now required to be also trained for CPDLC operation.
6.1.15 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 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).
6.2.2 123.45 MHz may be used to relay position reports via another aircraft in the event of an airground
communications failure. If necessary initial contact for such relays can be established on 121.5 MHz
- although great care must be exercised should this be necessary, as the frequency 121.5 MHz is to be
monitored by all aircraft operating in the NAT Region in case it is being used by aircraft experiencing
emergencies.
6.2.3 Therefore in order to minimise unnecessary use of 121.5 MHz, it is recommended that
aircraft additionally monitor 123.45 MHz when flying through NAT airspace.
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 6
NAT MNPS 29 Edition 2005
6.3 POSITION REPORTING
Time and Place of Position Reports
6.3.1 Unless otherwise requested by Air Traffic Control, position reports from flights on routes
which are not defined by designated reporting points should be made at the significant points listed in the
flight plan.
6.3.2 Air Traffic Control may require any flight operating in a North/South direction to report its
position at any intermediate parallel of latitude when deemed necessary.
6.3.3 In requiring aircraft to report their position at intermediate points, ATC is guided by the
requirement to have positional information at approximately hourly intervals and also by the need to cater for
varying types of aircraft and varying traffic and MET conditions.
6.3.4 If the estimated time for the ‘next position’, as last reported to ATC, has changed by three
minutes or more, a revised estimate should be transmitted to the ATS unit concerned as soon as possible.
6.3.5 Pilots must always report to ATC as soon as possible on reaching any new cruising
level.
Contents of Position Reports
6.3.6 For flights outside domestic ATS route networks, position should be expressed in terms of
latitude and longitude except when flying over named reporting points. For flights whose tracks are
predominantly east or west, latitude should be expressed in degrees and minutes, longitude in degrees only.
For flights whose tracks are predominantly north or south, latitude should be expressed in degrees only,
longitude in degrees and minutes. However, it should be noted that when such minutes are zero then the
position report may refer solely to degrees (as per examples below).
6.3.7 All times should be expressed in four digits giving both the hour and the minutes UTC.
Standard Message Types
6.3.8 Standard air/ground message types and formats are used within the NAT Region and are
published in State AIPs and Atlantic Orientation charts. To enable ground stations to process messages in
the shortest possible time, pilots should observe the following rules:
(1) use the correct type of message applicable to the data transmitted;
(2) state the message type in the contact call to the ground station or at the start of the message;
(3) adhere strictly to the sequence of information for the type of message;
(4) all times in any of the messages should be expressed in hours and minutes UTC.
6.3.9 The message types are shown below with examples:
POSITION
Example: “Position, Swissair 100, on 5649, 56 North 010 West at 1235, Flight Level 330, Estimating
56 North 020 West at 1310, 56 North 030 West Next”
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 6
NAT MNPS 30 Edition 2005
REQUEST CLEARANCE
Example: “Request Clearance, American 123, on 5616, 56 North 020 West at 1308,
Flight Level 330, Estimating 56 North 030 West at 1340,
56 North 040 West Next. Request Flight Level 350”
or if a position report is not required
“Request Clearance, Speedbird 212, Request Flight Level 370”
REVISED ESTIMATE
Example: “Revised Estimate, Speedbird 212, 57 North 040 West at 0305”
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