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post #1 of 8 Old 03-20-2011 Thread Starter
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Useful calculators

This may be old news, but I just came across this link and thought it pretty cool:

Course to Steer Calculator


Not just this one calculator, but all of them.
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post #2 of 8 Old 03-20-2011
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On a related topic, I have a Dalton E6-B Flight Computer (looks like http://www.vandeenensupport.com/projects/rs/index.html). Came with the boat. Any thoughts on using for accounting for leeway and/or drift, or computing true wind from apparent, etc?

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post #3 of 8 Old 03-20-2011
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The "EB6" calculator from any pilot shop. That's a mechanical calculator, i.e. paper or plastic wheels on a card, that can give you a fast graphic solution, no power or internet access needed.

If there were no instructions with it, you can find them online. Weems & Plath sell a gen-you-whine nautical version, but they work the same way.
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post #4 of 8 Old 03-21-2011
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I used the calculator to calculate the CTS using 1.5 knots of current from 135 degrees Magnetic and a boat speed of 6 knots and it replied with a CTS of 10.78 degrees towards the current.

WTF!

Firstly there isn't a helmsman that ever lived that could steer to 2 decimals of a degree and secondly, if you're going to offer to calculate a CTS then why not answer with a CTS and not with the angle you need to subtract from the widget and divide by the length of you whatsit to get to where your heading should be.

I never even bothered looking at the second calculator.

Sorry, not picking on anybody but geez . . . . .


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post #5 of 8 Old 03-21-2011
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Am I right in thinking that it thinks in term of the direction the current is coming from, rather than the direction the current is flowing to (i.e. the conventional way)?

s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27
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post #6 of 8 Old 03-22-2011
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What these calculators don't account for is the polars of a boat's velocity. Now that would be a great calculator in determining how to get from point A to B.

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post #7 of 8 Old 03-22-2011
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With my book "Formulae for the Mariner." I use a Casio fx-300ms caculator.
this is a wonderful book has just about all of your useful formulae in it. And note pages for other formulae you may want to add.
IMO, I find that it works better than any on line caculator.

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post #8 of 8 Old 03-22-2011
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Melrna: that would be great, but how would you input the polars? It's not like you could easily type them into a little box on the web page. As it is, the calculators don't take wind into account at all. But it sounds like an interesting challenge nonetheless.

s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27
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