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Old 20 February 2013, 12:42   #11
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I get harbour book but often its easier to plan using Show Prediction (free) - Littlehampton 20/02/2013 for 7 days - EasyTide and bookmarking the link.
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Old 20 February 2013, 13:46   #12
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Yes gerry i would be interested as my home port is never listed on all these so called helpful sites. i have to use another port so its not to accurate. can you advise when we can get it or will you make an announcement on here?
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Old 21 February 2013, 04:46   #13
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Sure - if you're interested, I'll post when it's released.

Just been playing with the pre-release version and notice it says it produces tides around the "NW European Shelf with particular focus on the British Isles", so when I put pins down on the map, I can actually get tide predictions along the French/Belgian/Dutch coast and right round Brittany. So better than I first said!

Gerry
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Old 13 March 2013, 12:08   #14
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Our anyTide app is now available in the app store. Search for "anytide" or go directly to:

https://itunes.apple.com/us/app/anyt...ign-mpt=uo%3D2

There's a page on our website that describes how to use it in reasonable detail. Worth looking at, since there are some useful, subtle features like the use of bookmarks to allow offline predictions :

AnyTide App - Products | National Oceanography Centre | from coast to deep ocean

Unfortunately, Apple didn't like us giving time-limited free data (i.e. up to the end of June), so we've had to take that out. The free version gives free predictions for the current day anywhere in the "NW European shelf" plus a preloaded bookmark near Liverpool, which is unlimited and allows you to see how it works over longer periods of time. A calendar year's worth of predictions in all included locations costs 1.49 via in-ap purchase.

I'd welcome any feedback, either via PM or contact me via the mail link on the NOC webpage shown above.

Thanks,

Gerry
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Old 13 March 2013, 12:46   #15
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One bit of customer feed back...... There are so many different ways I can get tide data for free (luckily I am based in the Solent) so I don't need to pay for the info.
Nevertheless hope it works out for you.
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Old 13 March 2013, 12:49   #16
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Gerry

Could you please advise on the discrepancy found between your app and easy tides? L/W 1 hour difference and 1m out? I can see that different height datum, but 1 hr difference?

Easy tide, low water 18:11 at 0.2m

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Old 13 March 2013, 12:50   #17
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Your app, approx 19:09 / 1m.

Unfortunately I don't have harbour masters tables infront of me to check but I'm pretty sure that in the past they have matched easy tide.
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Old 13 March 2013, 13:09   #18
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Hi Ian,

Thanks - interesting! I'll have a look...

Gerry

P.S. in the meantime, should have said it's worth looking at :
http://easytide.ukho.gov.uk/EASYTIDE...pport/faq.aspx

for some background on chart datum and possible differences in predictions (and some background on variability...)

NOC is responsible for the UK network of tide gauges, which provides the raw data for any tide predictors ( http://www.ntslf.org/networks/uk-national-network ), but that's not to say there isn't a possible issue with our model in easytide!
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Old 14 March 2013, 06:22   #19
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Ian,

Appreciate your feedback. Here's a detailed reply from one of our tidal scientists who worked on anyTide:

"The timing issue you point out is interesting and is only spotted by the keenest of observers! If you zoom in on the curve in anyTide you see that the minimum is actually quite flat in time. On Wed 13th evening the tide does not vary by more than 10cm for about an hour around the low tide. But since Easytide is only given accurate to the nearest 10cm, the discrepancy of about 1 hour is accounted for by their rounding off of the height prediction.

The difference in heights between the two predictions is a thorny problem. It corresponds to a difference in reference heights. The mean sea level for the easytide product is a historical chart datum. This is generally the most useful thing for sailors who know the area and know what a particular depth prediction means for them at that site. However in practise the mean sea level drifts in time such that an unfamiliar water user to an area could get a grounding surprise if the mean sea level had significantly changed since chart datum was set! Furthermore for the modelling part of this product chart datum values do not exist for all coastal locations. Therefore, for anyTide, we chose to use a datum that was, as close as possible, an accurate representation of the contemporary mean water depth for all prediction locations (which includes the observation sites like Littlehampton.)

This decision may well be confusing to many users. We will consider using chart datum (or at least having the option of it) in future updates."

We'll add an FAQ section to our web page and include explanations like this in it.

Any other comments or feedback are welcome. As before, post, PM or email me from the link on the NOC page.

Gerry
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Old 14 March 2013, 11:00   #20
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I purchased anytide and a years tides. first thing i found is the tide times on the graph are so small, i need glasses to read anything. A larger H or L with time would make it 100% easier than cramming all that data on one screen
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