The Rule of Twelfths for Tide Estimation and Navigation

[Benz]

Originally Posted by StuM

If you've got a device on board for internet connectivity, that's presumably a laptop, tablet or smartphone. There are many world wide tide programs for all of those devices which will give you just as good a tidal prediction as the internet ones (which generally use the same harmonics and base stations)


Here's the one I use on my laptop wxTide:

I had a small netbook, but no tide program loaded on it. Perhaps I'll try that for my next cruise.
In the meantime, I think the Rule is pretty nifty--it's a cool thing to know; I just haven't been in a situation where it would have been more crucial than simply knowing that the tide flows fastest at mid-tide.