Are Signals Unique?

From: Dan Robinson
Location: De Pere, WI
Email: daniel.robinson@snc.edu
Date: 6/24/2010
Time: 8:41:48 AM
Remote Name: 69.131.35.153

Comments

I've been told that each of the active lights along the Lakes has a unique signal or set of flashes to indicate to ships where they are along the Lakes. Is that true? If so, where would I find what the signals are for each of the lights? Thanks for any help you can give!