Lighthouses and Lightships With Fog Signals for North Atlantic (1974)

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3- Diaphone

Lighthouses with Audible Fog Signals

Boston Lightship MA DIAPHONE: 1 blast ev 30s (3sbl). N42 22.700 W070 47.000
Nantucket Shoals Lightship MA DIAPHONE, two-tone; 1 blast ev 30s (3sbl). N40 30.000 W069 28.000
Portland Lightship ME DIAPHONE, 1 blast ev 30s (3sbl). N43 31.600 W070 05.500