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post #10 of Old 09-16-2011
Donna_F
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Quote:
Originally Posted by TQA View Post
Errr if you are planning to navigate using some kind of onscreen electronic chart and rely on the depths displayed there here is a note of caution heard from the owner of a boat in a boatyard waiting for the damage surveyor to arrive.

"Well the chart plotter showed us in 42 feet of water when we went aground on the reef. "

Rely on a working depth sounder and set the alarm!
I keep returning to this and scratching my head. Perhaps you can help me understand the problem with the charter plotter? The NOAA RNC charts that I use mirror the paper charts. So if the paper chart says one depth, the e chart should say the same. Since the RNC charts are updated much more often (sometimes weekly), I update my paper charts using the weekly Local Notice to Mariners.

So I wonder if the owner in your example misread the chart plotter? Or, are the charts used in chart plotters different? I don't use one, I use paper and a laptop, so I'm just curious.

Thanks

Donna


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