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Old 06-11-2013, 10:51   #31
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Re: Dead Reckoning vs. GPS?

Originally Posted by boatpoker View Post
Delivering a 45' powerboat from Toronto to Chicago, my son and I got caught in thick fog in Lake Erie, We were close to the Canadian shore and all our electronics went down. After about 20hrs we were low on fuel and one engine went down. We were afraid to try and make port because of all the shallows along the shore so we DR'd to Pelee Island and found the break wall at the marina by feeling with a 16' boat pole. Fortunately we are in the habit of plotting a DR even with the electronics so we had a place to start when they crapped out.
For fixes I use GPS regularly. I scribble down the time and fix in a logbook, along with current heading and speed and whatever other info. I then plot that on the paper with a pencil. Takes barely any time and like you said, at worst I have a few hour old electronic fix and can DR from there.
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