CFR /  Title 33  /  Part 167  /  Sec. 167.51 In the approaches to Portland, ME: Precautionary area.

A precautionary area is established with a radius of 5.45 miles centered upon geographical position 4331.60 N, 7005.53 W, the areas within separation zones and traffic lanes excluded. [USCG-2010-0718, 75 FR 77533, Dec. 13, 2010]