Section 167.76 - In the approach to Boston, MA: Precautionary areas(a) A precautionary area is established with a radius of 6.17 nautical miles centered upon geographical position 42°22.71' N, 70°46.97' W.(b)(1) A precautionary area is established and is bounded to the east by a circle of radius 15.5 miles, centered upon geographical position 40°35.01' N, 68°59.96' W, intersected by the traffic separation schemes in the approach to Boston, MA, and Eastern approach, off Nantucket (part II of the TSS off New York) at the following geographical positions: | Latitude | Longitude |
| 40°50.47' N | 68°58.67' W. |
| 40°23.75' N | 69°13.95' W. |
(2) The precautionary area is bounded to the west by a line connecting the two TSSs between the following geographical positions: | Latitude | Longitude |
| 40°48.03' N | 69°02.95' W. |
| 40°36.76' N | 69°15.13' W. |
USCG-2010-0718, 75 FR 77534, Dec. 13, 2010