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(Thom Stewart) wrote in message ...
Joe,

You left out the most often used Nav system in use;

LOCAL KNOWLEDGE

Ole Thom

Yes local knowlede is another type of Navigation.

Here in the gulf we have coonass navigation as well. You just cruise
by an oil drilling rig and get the block number off the rig. Ive work
with a many of skippers that could not read and write and thats how
most navigated.

Joe