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post #71 of Old 07-11-2013
Roger Long
Retired Naval Architect
 
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Re: Need Opinion: Chart plotter, north up or course up?

I think the real issue with GPS only it that you use it differently when you don't know basic navigation. It's a well known principle in computers that mistakes are more likely to happen when someone is using them to do calculations they wouldn't know how to do by hand.

Good example:

I went up a very narrow river in Passamaquoddy Bay on a rising tide. It was quite an adventure for a sailboat with a keel. I made up all the way up without touching.

Going back, I had deeper water and the GPS track to follow. I struck twice. Why? Going up, I was watching the current pattens in the water, looking at the shore for clues to where the deep water was. Going down, I my attention was more on the GPS.
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