Tide Constants

Vegable

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Just planning a solo sail from Arisaig to Pwllheli in 2 weeks time and plan on departing from Scotland after overnighting in The Sound of Gigha.
In the sailing directions for the Sound of Gigha it states after N going and S going times:-
"Constant is approximately -0200 Oban (+0500 Dover) at springs, and -0500 Oban (+0300 Dover) at neaps"
And after 28 years of big boat sailing I suddenly realise I haven't a clue what it means. Mr Google has said something about harmonic tides and simple tides and has left me no wiser.
Can any one enlighten me please
Mike
 

VicS

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13 Jul 2002
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Just planning a solo sail from Arisaig to Pwllheli in 2 weeks time and plan on departing from Scotland after overnighting in The Sound of Gigha.
In the sailing directions for the Sound of Gigha it states after N going and S going times:-
"Constant is approximately -0200 Oban (+0500 Dover) at springs, and -0500 Oban (+0300 Dover) at neaps"
And after 28 years of big boat sailing I suddenly realise I haven't a clue what it means. Mr Google has said something about harmonic tides and simple tides and has left me no wiser.
Can any one enlighten me please
Mike

Add ( when positive) subtract (when negative) the figures ) 0200, 0500, etc to/ from the times of HW at the standard ports Oban or Dover to get the times at the secondary port ( or in this case the Sound of Gigha)
Interpolate for tides between springs and neaps.

From the almanac the north going tide begins at HW Oban + 0430 and the south going at HW Oban -0155
 
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