Tide App Fail

RoyS

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Jun 3, 2012
1,742
Hunter 33 Steamboat Wharf, Hull, MA
Yesterday while preparing my boat for launch next week I observed low tide surrounding my marina. I checked my trusty old tide application on my cell phone and was surprised to find that the tide was off by many hours. Further investigation revealed that the app had the correct date and time, the correct location but the tide height was clearly off by many hours. The failed app was Ebb Tide and I replaced that app with another one this morning. Beware.
 
Mar 6, 2008
1,311
Catalina 1999 C36 MKII #1787 Coyote Point Marina, CA.
You might like to use tide predictor 2.5. It works well.
I also use jtides.
They are both free and does not require wireless data.
 
Jan 19, 2010
12,553
Hobie 16 & Rhodes 22 Skeeter Charleston
I use one simply called "Tides" The icon looks like this.
1652541386467.png


I've been very happy with it so far.
 
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May 17, 2004
5,583
Beneteau Oceanis 37 Havre de Grace
I use Navionics on my phone, which has tide and current prediction built in. I like that it’s both, since they’re sometimes out of phase, and that you can pick spots on the map to see how the timings change for different locations.
 

Tedd

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Jul 25, 2013
772
TES 246 Versus Bowser, BC
Any chance it was out by exactly the difference between your time zone and UTC?
 
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Jan 1, 2006
7,498
Slickcraft 26 Sailfish
I think of tide predictions as a mere suggestion. Wind, the shape of the coast, the depth of the water and inlets make accurate predictions a very local phenomenon. Currents are even worse.
 
Jan 19, 2010
12,553
Hobie 16 & Rhodes 22 Skeeter Charleston
I think of tide predictions as a mere suggestion. Wind, the shape of the coast, the depth of the water and inlets make accurate predictions a very local phenomenon. Currents are even worse.
You also have to take into account where the station is located that your app is pulling its data. For instance, the tide app I use allows me to pick the closest station or to pin one that is of interest to me. I pin the one that is closest to work since that has the lowest draft on my morning commute. AND!!! I have crused the inlet very slowly while watching my depth vs. what the app says the tide is supposed to be so I know my local off-set.
 
Jan 1, 2006
7,498
Slickcraft 26 Sailfish
That raises a question about where the data for the tide apps comes from. Are the data just derived from the NOAA tables as can be found in Eldridge or is there another source such as satellite data, buoy data or station reports? Every time I've drilled down on where data comes from it was
for LI either The Race or Bridgeport from tables with corrections applied.
 
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Jan 4, 2006
7,219
Hunter 310 West Vancouver, B.C.
The failed app was Ebb Tide and I replaced that app with another one this morning. Beware.
And that's the reason I would NEVER rely on a tidal app, only a government document(s) which in Cananda are CHS volumes of tide and current tables.

1652556076467.png


1652556189199.png


Volume 5 also includes a few points for our southern neighbours in Juan de Fuca Strait.

They used to be available in soft cover for $6.00 which were the ultimate in convenience, but now you can download and print for FREE, FREE, FREE. Unfortunately you have to download and print all 200+ pages because there's useful info throughout each edition. Paper and laser printer ink are probably well over $6.00.
 
May 17, 2004
5,583
Beneteau Oceanis 37 Havre de Grace
I just downloaded Ebb Tide to see how it would look. Seems like it’s correct for my nearest tide station, but no matter what I do I can’t get it to show different times when I change the location. Pretty buggy; I’m not impressed.

Showing a tide chart (at least as well as paper) should be pretty trivial for apps at this point. It’s not exactly novel technology, as technology goes. An app that can’t get that right is pretty poor.


I thought we called 'em charts. :beer:
:beer: Now you have me deep in self-reflection as to why I used the landlubber term. Obviously a paper chart is a chart, and an electronic representation of the same thing is a chart. I guess something about the interactive content of the tides with changeable dates and times tied that to “map” instead of the relatively static “charts” in my brain when I was typing too fast.
 
Aug 19, 2021
505
Hunter 280 White House Cove Marina
I think of tide predictions as a mere suggestion. Wind, the shape of the coast, the depth of the water and inlets make accurate predictions a very local phenomenon. Currents are even worse.
That is exactly what happened. The wind was blowing from the Northeast and packing water into some areas like our little fishing village. High tide would crest about 3 hours late. That also means low tide never actually happens. This also causes what the locals call progressive flooding. One of our local old schools waterman called it.

The NOAA charts did not pick up the weather and shoreline effect.

On the Outer Banks of North Carolina the ocean side was wrecked all last week. The sound side was just the opposite, they had extremely low tides.

The distance between my location and OBX is a good 150 miles. I am sure this storm goofed up tides in Maryland too.
 
Aug 19, 2021
505
Hunter 280 White House Cove Marina

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jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
22,913
CAL 35 Cruiser #21 moored EVERETT WA
Crusty. You may be experiencing not only tide change, but wind effects of the last several days of wind blowing N to S and the run off of the spring rain storms that are adding to the normal tides in the Chesapeake.

I have been using a program called DeepZoom.com to get a glimpse at tide change and current flows.

NOWCOAST is the official data source as @JamesG161 indicates for US coastal needs. And as @Ralph Johnstone shares the Canadian Hydrographic Service is the official resource north of the 49th parallel.

An additional resource for the cruisers in the PacificNW is “Ports and Passes”.

1652577491882.jpeg

while a bit mor cost, it is said to be easier to decipher the info about the tides and currents that affect cruisers.
 
Aug 19, 2021
505
Hunter 280 White House Cove Marina
Crusty. You may be experiencing not only tide change, but wind effects of the last several days of wind blowing N to S and the run off of the spring rain storms that are adding to the normal tides in the Chesapeake.
No doubt about. It is the cost of living here. Here is another picture from January 2022 when a similar storm hit.

I will raise the house before I move.
 

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Jan 19, 2010
12,553
Hobie 16 & Rhodes 22 Skeeter Charleston
This is what tides displays… notice at the top how it show the station
D720C72D-FDE5-4EF1-A0F0-E25CE801B26B.png

you can also change the staton here

5FA85D9F-8150-4451-8FA5-99806E27C275.png

You can also see the stations on a map or as a list
69E14D0A-06A4-4931-BDF0-74F3598D7F6B.png


3CB26BA3-EF98-4849-95AC-3151F56E2339.png
 
Jan 1, 2006
7,498
Slickcraft 26 Sailfish
That is exactly what happened. The wind was blowing from the Northeast and packing water into some areas like our little fishing village. High tide would crest about 3 hours late. That also means low tide never actually happens. This also causes what the locals call progressive flooding. One of our local old schools waterman called it...
In the Peconic Bay estuary the same thing happens. An East wind will pile water up in the bays and there will be no "Low Tide." A West wind will blow the water out of the bay and there won't be a "High tide." I'm talking about a blow for several days. You can throw the tide tables out the window when that happens.
So far no one has said that the apps for tide have or use any data that is not published tide tables. So I'm concluding that the apps are just a better presentation of the same data.