33 C.F.R. § 167.52

In the approaches to Portland, ME: Eastern approach

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(a) A separation zone 1 mile wide is established and is centered upon the following geographical positions:

LatitudeLongitude
43°30.18′ N069°59.17′ W.
43°24.28′ N069°32.70′ W.

(b) A traffic lane 1/2 miles wide is established on each side of the separation zone.

[USCG-2010-0718, 75 FR 77533, Dec. 13, 2010]