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post #1 of 16 Old 09-30-2016 Thread Starter
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Florida Navigation

I was in Key West a couple weeks ago and I noticed that the 5'+ deep draft boat I sailed was regularly sailed over the line I drew on this chart.

Notice that they say it is only 2 feet deep.

We went right over that spot with no problem.

I get the sense that this might not be unusual off the FL coast.

Those of you who know FL is that true or was this an unusual exception.
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post #2 of 16 Old 09-30-2016
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Re: Florida Navigation

Dave, I used to fish that area regularly for tarpon, and the bar there washed away several years ago, leaving a great cut along the beach that holds lots of fish. I suspect you were sailing in the cut, which if I recall, dead ends about a quarter mile up the beach. Wish I were there right now instead of stuck here in Maryland for the upcoming winter.

all the best, and enjoy that wonderful part of the world - I envy you,

Gary
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Re: Florida Navigation

The "2" you are seeing is an old spot sounding. The general depth in that channel, however, is 6 feet or better. The apparent discrepancy is not unusual.

FWIW...

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post #4 of 16 Old 09-30-2016
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Re: Florida Navigation

Are charts not in fathoms? So like 2 fathoms is like 12 or so feet..


Edit 1 fathom = 6 feet

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post #5 of 16 Old 09-30-2016
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Re: Florida Navigation

A fathom is 6 feet so two fathoms would be 12 feet.
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post #6 of 16 Old 09-30-2016 Thread Starter
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Re: Florida Navigation

Quote:
Originally Posted by UPHILL View Post
Are charts not in fathoms? So like 2 fathoms is like 12 or so feet..


Edit 1 fathom = 6 feet
Not in this case.
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post #7 of 16 Old 10-01-2016
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Re: Florida Navigation

Well, then the sea levels are a rising. Florida will be under water, just sail around the roof tops.

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post #8 of 16 Old 10-01-2016
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Re: Florida Navigation

I think there is a tendency to take soundings as gospel. A lot of factors can impact the truth of this. Surveys, including soundings, can be decades or more old and in some areas things change dramatically over the years. Also surveys were done to support commercial shipping and naval activities. Detailed soundings in shallow areas may not be done very carefully. Get outside developed countries and it is even worse. In Indonesia we passed through an area that was shown as land when in fact the depth sounder could not even find bottom (generally this is >450' deep. Common sense and eyeball navigation works very well.
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post #9 of 16 Old 10-01-2016
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Re: Florida Navigation

How about the tidal range in that spot? Might just take a three foot tide to float your boat over that spot...


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post #10 of 16 Old 10-01-2016
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Re: Florida Navigation

So you got the whole Beaufort chart and it shows a couple sounding lines where some ship went by 10 yrs ago and maybe a comment 'breakers sighted' The shoreline doesn't show on radar and GPS /plotters only a dream of future. So much safer today,depending solely on the work of others
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