(c)
Between the hours of 1400-0400Z++, aircraft intending to fly an off airway track which is parallel to and within 90 NM of High Level airways shall flight plan via airways. In the case of CMNPS certified aircraft, the 90 NM is reduced to 60 NM.

(d)
It is recognized that there are routes of flight which cannot make use of the relatively few established tracks in the Arctic Control Area. In such cases, pilots may file via the most appropriate route. However, ATC may, when traffic conditions warrant, clear aircraft via routes other than those flight planned.

(2)
POSITION REPORTING - The W141°, W115° and W60° lines of longitude have been selected as position reporting lines for the ACA. Flights shall report as follows:

(a)
Flights traversing the ACA shall report at the point at which the W141°, W115° and W60° lines of longitude are crossed. If crossing the ACA N of N87° latitude, the W115° position report is not required.

(b)
Westbound flights which do not cross the W60° line of longitude on entry or prior to entry into the ACA shall report at their point of entry into the ACA.

(c)
Westbound flights which do not cross the W141° line of longitude prior to leaving the ACA shall report at their point of exit from the ACA.

(d)
Eastbound flights which do not cross the W141° line of longitude on entry into the ACA shall report at their point of entry into the ACA.

(e)
Eastbound flights which do not cross the W60° line of longitude on leaving or after leaving the ACA shall report at their point of exit from the ACA.

(f)
Northbound or Southbound flights which will not cross the significant position reporting lines shall report at their points of entry into and exit from the ACA.

(g)
Flights operating on one of the established Arctic Tracks shall make position reports in accordance with the reporting points depicted on the FLIP Enroute High Altitude Charts.

(h)
Flights that will penetrate the Canada Air Defense Identification Zone while in the ACA, may forward the required estimated time and place of the Air Defense Identification Zone penetration as part of their W115° longitude or Mould Bay position report.

(3) AIR/GROUND COMMUNICATION -
(a)
On entry, or prior to entry into the ACA, communications should be established with Cambridge Bay (CYCB) on one of the International HF Air/Ground frequencies listed in the current Canadian Flight Supplement. Maintain a listening watch on this station while in the area, unless otherwise instructed.

(b)
If communication cannot be established with Cambridge Bay (CYCB), contact should be established through Iqaluit (CYFB), Churchill (CYYQ) or other International Station on a published frequency.

(NAV CANADA/GPH 204, CH 5, SEC 3 & TP 1820E, M7)
f. CANADIAN MINIMUM NAVIGATION PERFORMANCE SPECIFICATIONS (CMNPS) AIRSPACE -
　
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