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other (using vertical separations via different flight level allocations), and in some cases may not extend from
coast-out to coast-in (necessitating random routing to join or leave). Similarly, some westbound tracks may
commence at 30°W, North of 61°N, to accommodate NAT traffic routing via the Reykjavik OCA and
Northern Canada.
Collaborative Decision Making Process
2.2.3 Operators proposing to execute NAT crossings during the upcoming OTS period are
encouraged to contribute to the OTS planning process. A comprehensive set of Collaborative Decision
Making (CDM) procedures for NAT track design is now employed.
2.2.4 This CDM process commences with the Preferred Route Message (PRM) system, which has
been used in the NAT Region for many years. To enable oceanic planners to take into consideration
operators' preferred routes in the construction of the OTS, all NAT operators (both scheduled and nonscheduled)
are urged to provide information by AFTN message to the appropriate OACs regarding the
optimum tracks of any/all of their flights which are intended to operate during the upcoming peak traffic
periods. Such information should be provided, in the correct format, as far in advance as possible, but not
later than 1900 UTC for the following day-time OTS and 1000 UTC for the following night-time OTS.
Addresses and formats for providing PRMs are published in the Canadian and UK AIPs/NOTAMs.
2.2.5 Subsequently, following the initial construction of the NAT tracks by the publishing
agencies (Gander OAC for Eastbound tracks and Shanwick OAC for Westbound tracks), the proposed tracks
are published on an internet site for interested parties to view and discuss. One hour is allocated for each of
the proposals during which any comments will be considered by the publishing agency and any changes
which are agreed are then incorporated into the final track design. This internet site is currently operated by
NAV CANADA. Access to this site is by password which any bona fide NAT operator may obtain on
application to NAV CANADA - see Canada AIP for details.
2.3 THE NAT TRACK MESSAGE
2.3.1 The agreed OTS is promulgated by means of the NAT Track Message via the AFTN to all
interested addressees. A typical time of publication of the day-time OTS is 2200 UTC and of the night-time
OTS is 1400 UTC.
2.3.2 This message gives full details of the co-ordinates of the organised tracks as well as the
flight levels that are expected to be in use on each track. In most cases there are also details of domestic
entry and exit routings associated with individual tracks (e.g. ‘NERS…’ or ‘NAR …..’). In the westbound
(day-time) system the track most northerly, at its point of origin, is designated Track 'A' (Alpha) and the next
most northerly track is designated Track 'B' (Bravo) etc. In the eastbound (night-time) system the most
southerly track, at its point of origin, is designated Track 'Z' (Zulu) and the next most southerly track is
designated Track 'Y' (Yankee), etc.. Examples of both eastbound and westbound systems and Track
Messages are shown below in this Chapter.
2.3.3 The originating OAC identifies each NAT Track Message, within the Remarks section
appended to the end of the NAT Track message, by means of a 3-digit Track Message Identification (TMI)
number equivalent to the Julian calendar date on which that OTS is effective. For example, the OTS
effective on February 1st will be identified by TMI 032. (The Julian calendar date is a simple progression of
numbered days without reference to months, with numbering starting from the first day of the year.) If any
subsequent NAT Track amendments affecting the entry/exit points, route of flight (co-ordinates) or flight
level allocation are made, the whole NAT Track Message will be re-issued. The reason for this amendment
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 2
NAT MNPS 8 Edition 2008
will be shown in the Notes and a successive alphabetic character, i.e. ‘A’, then ‘B’, etc., will be added to the
end of the TMI number (e.g. TMI 032A).
2.3.4 The remarks section is an important element of the Track Message. The Remarks may vary
significantly from day to day. They include essential information that Shanwick or Gander need to bring to
the attention of operators. These Remarks sometimes include details of special flight planning restrictions
that may be in force and in the case of the Night-time Eastbound OTS Message, they include information on
clearance delivery frequency assignments. The hours of validity of the two Organised Track Systems (OTS)
are normally as follows:
Day-time OTS 1130 UTC to 1900 UTC at 30°W
Night-time OTS 0100 UTC to 0800 UTC at 30°W
2.3.5 Changes to these times can be negotiated between Gander and Shanwick OACs and the
　
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