Guidance concerning Air Navigation in and above the NAT MNPSA
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).
All times should be expressed in four digits giving both the hour and the minutes UTC.
Radio operators may simultaneously monitor and operate more than one frequency.
Therefore, when initiating an HF voice contact it is helpful if the pilot include advice on the frequency being used (see examples below).
Standard Message Types
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:
use the correct type of message applicable to the data transmitted;
state the message type in the contact call to the ground station or at the start of the message;
adhere strictly to the sequence of information for the type of message;
all times in any of the messages should be expressed in hours and minutes UTC.
The message types are shown below with examples:
“Position, Swissair 100, on 8831, RESNO at 1235, Flight Level 330,
56 North 020 West at 1310, 56 North 030 West Next”
“Request Clearance, American 123, on 8831, 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 on 3476, Request Flight Level 370”
“Revised Estimate, Speedbird 212 on 3476, 57 North 040 West at 0305”
MISCELLANEOUS Plain language – free format
Addressing of Position Reports
Position reports for aircraft operating on tracks through successive points on the mutual
boundary of two OCAs (e.g. when routing along the 45ºN parallel), should be made to both relevant OACs.
(In practice this only requires an addition to the address. (e.g. “Shanwick copy Santa Maria”.)
NAT Doc 007