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Old 03-21-2011, 08:09 PM   #21
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Originally Posted by redbopeep View Post

Cloud sourcing and cloud data is all very interesting. However, the result is going to have a great deal of uncertainty in it. Given enough data in a particular location, you will have a reasonable picture of what is going on. However, it will take huge numbers of data points to get a chart reliable enough for use in navigation.

What sort of corrections to GPS data? Are you collecting which GPS system and what triangulation/sat's are in play when the data is being collected? Depth--how will you actually know that the boater is providing you with accurate depth information rather than simply depth below the transducer?

Again, cloud sourcing is a wonderful way to get large and helpful/useful datasets. It isn't necessarily a good way to pin point something with accuracy or precision.
It seems to me that this is a good way to find places where more than usual caution is required. If you have a series of hints that a rock may be a mile north-east of it's charted location, for example, you may choose to take all chart data near it as a hint rather than a fact.

OTOH, a health mistrust of charts is a good idea lots of times anyway.

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Old 03-22-2011, 01:27 AM   #22
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That series of hints if it came via GPS may simply be an indicator that the GPS datum isn't quite right for the location you're cruising in. If you cruise exclusively using GPS, well then indicators that GPS is "off" in a particular area is good to know.

I have a "healthy mistrust" of people's ability to navigate using GPS. Oftentimes, we are shown via GPS to be quite a distance away from known visible things that I can see: shoreline (GPS has shown me sailing along ON shore many times), channel marker, rock, etc.

What is better, IMHO, is to become good with the paper charts and dead reckoning. But hey, that's just me.
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Old 03-22-2011, 05:16 PM   #23
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...

What is better, IMHO, is to become good with the paper charts and dead reckoning.¬*¬*But hey, that's just me.
You are perfectly right and not alone!

This is what we love about sailing: doing the navigation work on real paper charts.

We don't even have a GPS street navigator in our car!

Uwe

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