Guidance concerning Air Navigation in and above the NAT MNPSA
Since 5 June 2008 the former West Atlantic Route System (WATRS) together with the
Atlantic portion of Miami Oceanic Airspace and the San Juan FIR has been designated "WATRS Plus Airspace”. RNP-10 or RNP-4 Approval is required in order to bene it from the 50 NM minimum lateral separation employed here. Any MNPSA Aircra t intending to also ly in this WATRS Plus airspace should ensure that its RNP Approval status is included in the Flight Plan.
Speci ically such operators should:
i) annotate ICAO Flight Plan Item 10 (Equipment) with the letters “R” and “Z”, and
ii) annotate Item 18 (Other Information) with, as appropriate, (no spaces).
“NAV/RNP10” or “NAV/RNP4”
Full details can be found at : http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/enroute/oceanic/WATRS_Plus/
For turbojet aircraft the Speeds/Mach Number planned to be used for each portion of the
flight in the NAT Region should be specified in Item 15 of the flight plan.
For turbojet aircraft, Item 15 of the flight plan should reflect the proposed speeds in the
cruising True Airspeed (TAS) prior to oceanic entry;
oceanic entry point and cruising Mach Number;
TAS subsequent to oceanic exit .
For non-turbojet aircraft TAS should be specified in Item 15 of the flight plan.
FLIGHT PLANNING REQUIREMENTS ON SPECIFIC ROUTES
Flights Planning on the Organised Track System
If (and only if) the flight is planned to operate along the entire length of one of the
organised tracks, from oceanic entry point to oceanic exit point, as detailed in the NAT Track Message, should the intended organised track be defined in Item 15 of the flight plan using the abbreviation 'NAT' followed by the code letter assigned to the track.
Flights wishing to join or leave an organised track at some intermediate point are considered
to be random route aircraft and full route details must be specified in the flight plan. The track letter must
not be used to abbreviate any portion of the route in these circumstances.
The planned Mach Number and flight level for the organised track should be specified at
either the last domestic reporting point prior to oceanic airspace entry or the organised track commencement
Each point at which a change of Mach Number or flight level is planned must be specified
by geographical co-ordinates in latitude and longitude or as a named waypoint.
For flights operating along the whole length of one of the organised tracks, estimates are
only required for the commencement point of the track.
NAT Doc 007