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Old 21 September 2020, 08:15   #1
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Navionics tide info

I notice for today low tide in Cobh Cork harbour on my navionics app is .25m whereas on windfinder and other tide apps the low tide value is 1.1m
What am I missing?
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Old 21 September 2020, 13:36   #2
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What am I missing?
You've been shortchanged outta 0.85m!

That's the difference getting out of Fahan Marina and a day in the pub.

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Old 21 September 2020, 14:50   #3
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You've been shortchanged outta 0.85m!

That's the difference getting out of Fahan Marina and a day in the pub.

Eh dont give up the day job
Can anyone explain, low tide heights are kinda important as a lot of ribbers with busted props will testify
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Old 21 September 2020, 16:27   #4
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Can anyone explain, low tide heights are kinda important as a lot of ribbers with busted props will testify
Well, tides are estimated and v. dependant on Pressure and Wind direction/speed, so I'd be wary of using 0.85m as a prop guard. The variation may be down to the different platforms using different algorithms* to calculate tidal heights, different datum points and possibly (more likely) in this case, different times, i.e. summer/winter - have you checked? Also, your plotter software may need updated? For the craic, compare tidal peaks on printed charts to various electronic sources - they will likely all vary a tad.

*The prediction of Tidal data made by viewing the movements of seaweed...

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Old 22 September 2020, 06:57   #5
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Different datum maybe but how could time reference explain the minimum depth displayed as reached?
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