tide tables & clock change

[johnchristie]

hi all
do i need to add +1 hour to the tide table now the clocks have gone back?

thanks
john

 

[sailorman]

hi all
do i need to add +1 hour to the tide table now the clocks have gone back?

thanks
john

no tide tables are on GMT .add an Hr for summer time

 

[johnchristie]

oppss all summer i haven't added +1 to the tide table.
i'll remember that for future.

luckily ive got away with it.

 

[johnchristie]

scrap that.
the site i use automatically adjusts for bst.

 

[timbartlett]

scrap that.
the site i use automatically adjusts for bst.

I was just going to say " it all depends ..."!

Individual tide tables vary -- plus there is the fact that some secondary ports are referred to standard ports that may be in a different country that uses a different standard time. So it pays to check with the actual tide table you are using, rather than making assumptions.

 

[guernseyman]

Broadly, tide times are calculated in GMT (UTC + 0) and what one might call 'primary' tide tables, such as in almanacs, will use that time. 'Secondary' tables, such as those prepared for a port, are likely to be local time, i.e. adjusted for summer time.

If the table does not declare its time basis, it would be wise to check the tide times at the beginning and end of summer time (last Sunday in March, October) looking for a possible jump of an hour - if summer time has been adjusted for. With care, because the interval between tides varies from springs to neaps by about an hour. Or use another table.

 

[Kawasaki]

hi all
do i need to add +1 hour to the tide table now the clocks have gone back?

thanks
john

john
It depends on which tide tables you are looking at
Most are in G.M.T
Now called U.T.C in some tables
Don't worry yourself about that
They are the same as far as time is concerned
If you are looking at an almanac, like 'Reads' etc all times will be in G .M.T as we know it.
They might be written as U.T.C but as I said, tiss the same thing
So, you add an hour to these during B.S.T!!
Then you are back to gmt/utc in the winter as it were
I always use
To 'add' an hour in the spring
IE-- spring forward
Then during the autumn when we put the clocks 'back'
autumn, 'fall' across the pond but easy to remember
'Fall Back'! so take an hour off


See, the whole thing was re arranged a while back
As per normal the Frogs wanted to butt in on G.M.T!

We wanted
Coordinated Universal Time
'CUTS'
Yer frogs however wanted
'Tucs'
Temps universal coordonne
Anyway
Tiss UTC now

What you have to be careful about
Some Marinas and local authorities, adjust their tide tables to account for what we are used to as 'B.S.T' !!
Most Nautical almanacs do not do this and expect the Mainer to adjust and work this out for him/ herself [bleedin eck getting all PC with this him her stuff) and apply accordingly

So, with all that garbage out of the way
Check if your marina/dock/ local authority has printed or predicted tides in
G.M.T
Or U.T.C

Add an Hour in the 'Spring Forward' and deduct an hour in the 'Fall Backwards'

Does that make sense?

Be unusual if one of My posts does

 

[shaxi]

Add an Hour in the 'Spring Forward' and deduct an hour in the 'Fall Backwards'

Does that make sense

make no sense ,of course !

 

[oldgit]

My local tide table for Sheerness has a blue tinred background to indicate when BST is in force .
The appropiate hour is added/removed by the publisher-printer.