The District Liaison Officer suggested a system for the control of coastal lighthouses as employed by the Canadian Navy to be initiated in a similar way for U. S. Lighthouses. The Canadian Plan consisted of a broadcast three times a day at regular hours to all lighthouse keepers along the Coast. The system was divided into lettered plans; i.e., Plan "A" meant to keep lights burning bright, "B", submarine scare and all lights must be extinguished, etc. The District Coast Guard Officer did not accept this recommendation as the District plan then in use provided for extinguishment or relighting of any or all lights on a few minutes advance notice. The District system had the following advantages:
(a) It provided more positive communication and means of checking receipt of instruction.
(b) It provided greater security and more flexibility of instruction.
(c) It did not depend on any outside agency.
Proposals for dimming coastal lights were di(s)approved because of the unlighted gaps between lights which would have existed when the lights were dimmed.
A test blackout was held in March, 1942, for all Lifeboat and Light Stations. As a result of this test, it was decided that Seattle Radio Station, Westport, would, in the future, broadcast a whistle blast preceding the instructions for blackout. Upon hearing the whistle over the air, all personnel standing radio watches were instructed to copy the message which followed and notify their Commanding Officers. Because of the possibility that telephone communications between Lifeboat and Light Stations might not be available at the time a blackout was ordered, all Light Stations which were radio-equipped were ordered to maintain a radio watch during the entire time the light was burning.
Revisions of the Blackout Plan^1 were made periodically to keep each section of the District cognizant of any changes in that particular area. After each revision, holders of Blackout Plans were ordered to destroy copies of previous Plans by burning. In 1945, a complete coverage of state railroad bridges, covering the area as far east as the Cascades, was completed and included in the Plan. It was advised by the Aids to Navigation Officer that similar blackout regulations be continues during peace time so that any confusion, in the event of a similar emergency, might be eliminated. It was further recommended that tests of the Plan be made occasionally be effecting a total blackout as there was no
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