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Old 20 October 2021, 06:04   #21
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As an aside to this, for us Luddites that still use paper charts, it is worth looking to see when the area was surveyed. There is normally a little map with survey dates on the chart somewhere.

If the area of interest was surveyed in 2016 for example, it is probably going to be more accurate than an 1876 lead line survey.

https://www.ths.org.uk/documents/ths...ho_article.pdf

Firms like Garmin use the same data but augmented by their own surveys plus user data - crowd sourcing I suppose.

Apologies for the thread creep.
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Old 20 October 2021, 06:13   #22
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Garmin own navionics and as far as Im aware Cmap too.
Amendments to charts is updated every two weeks according to one of the questions in my coxswain course.
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Old 20 October 2021, 19:15   #23
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Quote:
Originally Posted by jonp View Post
With the G3 vision charts, if the area has been surveyed you can expect the rocks to show exactly where they actually are on the chart, unlike older style charts that give you a rough idea there might be something in the area and also a rough idea of depth.. Contours are rough guides but don't show detailed structure where you can literally pull straight over the top of a pinacle and dive it knowing which side has the deepest face etc before hopping in the water (or fishing it).
Thanks for that - I'll take a look at the G3 charts. My Garmin came preloaded with Navionics charts for the UK, but they did seem to lack detail. But as a novice I was not sure what to expect. So thanks for the detailed posts.
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