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Old 08-03-2013, 12:29 AM   #1
pascavone's Avatar
Join Date: Nov 2010
Location: Massapequa, New York, United States
Posts: 762
Default explain ebs, flood and slack graphic on my garmn

i click on the title graphic on my garmin and and confused on the flood and slack graphic before and after ties.

It shows a Red color "plato" indicting slack, and the drops off on a diagonal to Blue to indicate flood.

then it gives the time countdown to the next event, which i usually can't keep straight.

just want to know what the currents doing.....

105 gallon at 8 lbs. = 845 lbs added, and i'm only running 14 mph, but the current could be doing 6mph under the boat....

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Old 08-12-2013, 02:18 PM   #2

Join Date: Apr 2008
Posts: 5,011

Ebb = The movement of tide back towards the sea. This exposes the intertidal zone (aka Falling Tide)
Flood = The movement of tide from the sea, towards land. This covers the intertidal zone (aka rising tide)

High Tide = The point where the sea changes from Flood to Ebb
Low Tide = The point where the sea change from Ebb to Flood

Slack Tide (Slack Water) = Period of time just before and after High and Low Tide.

As we get to about 1+ hour before High Tide, the flood slows dramatically. At and about 1+ hour after high tide, the ebb begins very slow. There is relatively little change between slack flood to slack ebb. The same occurs just prior to and following the low tide. The majority of water is moved during the exact mid point of the Ebb and Flood.

I'm not sure if you can calculate the actual speed the flow is travelling as that will vary based on the natural geography of the area. It will tell you whether or not you will be bucking the tide or running with it and whether you are running at the best or worst times. Lately, we've been playing around with running WITH the tides, and preferably when they are flowing the strongest. We've found a surprising amount of fuel economy in doing so.

We've also been looking at wind speed and direction. Wind opposing tide makes for a snotty ride. It also depends on if you're travelling through an odd area, like The Race that seperates Long Island Sound from Block Island Sound. There, crossing during a slack is much preferred.
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