A line drawn from the easternmost tower at Nahant, charted in approximate position latitude 42[deg]25.4[min] N., longitude 70[deg]54.6[min] W., to Boston Lighted Horn Buoy ``B''; thence to the esternmost radio tower at Hull, charted in approximate position latitude 42[deg]16.7[min] N., longitude 70[deg]52.6[min] W. [CGD 79-066, 45 FR 15176, Mar. 10, 1980. Redesignated by CGD 81-017, 46 FR 28154, May 26, 1981]