Since daylight saving time started early this year it may be confusing when using tide charts or software for the next month. I use Nobeltec Tides & Current Pro and noticed that standard time continues until April 6. That extra hour offset could be a problem for some of us that navigate in shoal waters.
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Tide charts
It was for me today. I was expecting it to be low at 4 PM where I dock I was suprised how low it was at 1 PM when I returned from a nice morning of sailing. Another hour and I was sitting on the bottom, thankfully, all tied up at the dock. I was wondering why the tide charts did not agree....now I know.
It was for me today. I was expecting it to be low at 4 PM where I dock I was suprised how low it was at 1 PM when I returned from a nice morning of sailing. Another hour and I was sitting on the bottom, thankfully, all tied up at the dock. I was wondering why the tide charts did not agree....now I know.
For me
In this area of the gulf coast, it doesn't make much difference. We only get a tide range of a couple of feet, and only one high and one low a day. So an hour really doesn't make much difference. The wind has much more effect, and if entering shallow water it is necessary to pay as much or more attention to wind direction and speed as it is to the tide.
In this area of the gulf coast, it doesn't make much difference. We only get a tide range of a couple of feet, and only one high and one low a day. So an hour really doesn't make much difference. The wind has much more effect, and if entering shallow water it is necessary to pay as much or more attention to wind direction and speed as it is to the tide.
Around here it matters a lot
The tide will drop 9.5 ft tomorrow morning in 6 hours. My home port has a shallow entrance so it is critical to know.
The tide will drop 9.5 ft tomorrow morning in 6 hours. My home port has a shallow entrance so it is critical to know.
I can understand
I can certainly understand how important this would be to some. With tides running 8 or 9 feet, twice a day, an hour could be a really big deal.
I can certainly understand how important this would be to some. With tides running 8 or 9 feet, twice a day, an hour could be a really big deal.
Everything is relative. We have a small tidal range
of +1.5' to -1.5' but when we skim the bottom at 6" under the keel at slack tide to get out of our channel we need to watch fluctuations very closely. Wind affects the astronomical tide on a closed bay enhancing or decreasing it depending on its direction. We use the old trusted method of checking our depth sounder at the slip. We need at least 1.5 feet under the keel at the dock to be able to clear the channel. I also know that coming in I need at least 2.5 feet at the entry marker under the keel to clear the channel. I use the tide charts as an indication to plan arrivals and departures but the water under the keels determines the actual schedule.
of +1.5' to -1.5' but when we skim the bottom at 6" under the keel at slack tide to get out of our channel we need to watch fluctuations very closely. Wind affects the astronomical tide on a closed bay enhancing or decreasing it depending on its direction. We use the old trusted method of checking our depth sounder at the slip. We need at least 1.5 feet under the keel at the dock to be able to clear the channel. I also know that coming in I need at least 2.5 feet at the entry marker under the keel to clear the channel. I use the tide charts as an indication to plan arrivals and departures but the water under the keels determines the actual schedule.
Software update
You posting reminded me that my Lowrance 110C has a problem with the Navionics tide and current data, and not just with this window with the new early DST start time. It was insideous, because it would use the non DST adjusted timestamp in the unit against a DST card data, so it was an hour off all summer long. So off I went to the Lowrance support pages, and found that they have an update, which includes: "# Improved Tides and Currents to compensate properly for Daylight savings time" So if you are having problems with software/firmware - consider looking for a newer version. Most of the software DST issues were solved last year.
You posting reminded me that my Lowrance 110C has a problem with the Navionics tide and current data, and not just with this window with the new early DST start time. It was insideous, because it would use the non DST adjusted timestamp in the unit against a DST card data, so it was an hour off all summer long. So off I went to the Lowrance support pages, and found that they have an update, which includes: "# Improved Tides and Currents to compensate properly for Daylight savings time" So if you are having problems with software/firmware - consider looking for a newer version. Most of the software DST issues were solved last year.
My copy of Reed's notes that it is corrected for
daylight savings time. If the dates are wrong and you can't correct for that then there is a posibility that you can't read the tables. Add or subtract an hour ani't rocket science. Just check and see when the correction is applied.
daylight savings time. If the dates are wrong and you can't correct for that then there is a posibility that you can't read the tables. Add or subtract an hour ani't rocket science. Just check and see when the correction is applied.
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