I trust my GPS Chartplotter. I have sailed with it for about 5 years and have never seen even a slight error on its part. BUT, nothing is fool proof! I always keep a chart (paper book) and necessary tools handy for when i need them. I served as a navigator on a race team for many years before the advent of GPS and I learned to trust my skills when I was sailing in skinny water with a deep draft boat. Just like there is no perfect boat or no perfect sail, a GPS is just a tool in your box of tricks to help YOU get form point A to Point B. Trust it but constantly question its output and be on guard for errors. I sail on The Chesapeake Bay which is a skinny water inland sea. While it is not open blue water, it does require navigation for anything more than a short daysail.
When I am ailing and have a question a to where I am, I turn to a chart and check with the GPS.
Sailing on The Central Chesapeake Bay, West River, MD on my Catalina 27, Aelous II with my wife and friends.
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