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Communications at sea.

The following conversation was purported to have occurred with 
signal lights in Morse Code one cold foggy night at sea:

#1: PLEASE DIVERT YOUR COURSE 15 DEGREES TO LEFT TO AVOID A COLLISION.

#2: YOU DIVERT YOUR COURSE 15 DEGREES TO RIGHT TO AVOID A COLLISION.

#1: I AM THE CAPTAIN OF A US NAVY FRIGATE.  YOU DIVERT YOUR COURSE.

#2: NO.  YOU DIVERT YOUR COURSE.

#1: THIS IS A LARGE WARSHIP OF THE U.S. NAVY.  DIVERT YOUR COURSE NOW!

#2: THIS IS A LIGHTHOUSE.   YOUR CALL.
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