Guidance concerning Air Navigation in and above the NAT MNPSA
Where necessary make up the correct number of figures by insertion of zeros (e.g. a point on radial 180 at a distance of 40 NM from VOR “DUB” should be expressed as DUB180040).
Change of Speed or Level (maximum 21 characters)
The point at which a change of speed (5% TAS or 0.01 Mach or more) or a change of level is planned, expressed exactly as in (2) above, followed by an oblique stroke and both the cruising speed and the cruising level, WITHOUT A SPACE BETWEEN THEM, even when only one of those quantities will be changed.
Examples LN/N0284A045; MAY/N0305F180; HADDY/M084F330; 4620N05005W/M082F350. Note: “N” = knots; “M” = Mach; “F” = flight level; “A” expressions of height see ICAO Doc 4444).
= altitude in hundreds of feet. (for other
Cruise Climb (maximum 28 characters)
The letter C followed by an oblique stroke then the point at which cruise climb is planned to start, expressed exactly as in (2) above, followed by an oblique stroke; then the speed to be maintained during cruise climb followed by the two levels defining the layer to be occupied during cruise climb, or the level at which cruise climb is planned followed by the letters “PLUS”, WITHOUT A SPACE BETWEEN THEM.
Examples C/48N050W/M082F290F350; C/48N050W/M082F290PLUS;
Field 16: Destination Aerodrome and Total Estimated Elapsed Time, Alternate Aerodrome(s)
Destination Aerodrome and Time (8 characters)
Insert the ICAO four-letter location indicator of the destination aerodrome followed, WITHOUT A SPACE, by the total estimated elapsed time,
If no location indicator has been assigned, insert ZZZZ followed, WITHOUT A SPACE, by the total estimated elapsed time, and specify in Item 18 the name of the aerodrome preceded by DEST/.
Total Estimated Elapsed Time
For IFR flights this is the total estimated time from take-off until arriving over the designated point from which it is intended that an Instrument Approach Procedure, defined by reference to navigation aids, will commence, or, if no navigation aid is associated with the destination aerodrome, until arriving over the destination aerodrome itself.
For VFR flights this is the total estimated time from take-off until arriving over the destination aerodrome.
NAT Doc 007