secondary port calculations

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Spankerwrap

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Does anyone know of (or has created0 a "pro forma" style master sheet for the calculation of secondary port heights which can be downloaded. You know, fill the boxes in and follow a sequence to achieve the final tidal height.

It is the one thing doing my head in during my Yachtmaster theory course. If not I will have a go a creating one but even the thought of it freezes my brain. . . . . .

Cheers
 
hmm, think I will be able to get it into the exam room this Saturday without the examiner noticing?

I was going to put the answer as " radio in to the harbour master and ask him when it will be safe to arrive", but the instructor has said I won't get many marks for that.

Showing initiative I thought. . . . . .
 
When doing my Yachtmaster theory a couple of years ago I made up something similar to the worksheet which I then laminated. I found that if the surface of the laminating film was abraded lightly with fine sandpaper I could then write on it with a normal pencil and rub it out afterwards for the next calculation. It saved time not having to redraw everyting for each question in the exam and did not require the use of a chinagraph pencil which I could never get a fine point to anyway.

John
 
Sorry Spankerwrap I thought you wanted to use it in real life not in a classroom.If you are taking the test on saturday and still need info then the instuctor obviously has not given you enough tuition.
 
real life? Oh no, in real life I am off to the Med at the end of March to charter my newly purchased cat for the summer.

Tidal range in the port where my boat is kept? 28cms (11 inches in the old money). I need to be able to do SPCs in real life like I need to be able to calculate the angle of vanishing stability for my boat! (whatever that means)

Still, gotta be done. I am afraid that my inability to grasp the SPC theory is down to my addled brain freezing at the very mention of the words, more than the ability of my tutor. ( I have to say that in case he is reading this. After all he does mark the exam paper!)

Now, once more, if high water is between 00.00 and 07.00 . . . . . . . .
 
Secondary ports are referenced to "a particular" Primary Port who's tidal curves can vary dramatically.
There is no generic tidal curve so if I've understood your question correctly....... no, you can't do it.
Hope this makes sense.
 
well, just in case anyone is interested, and again thanks to all those who took the time and trouble to answer, I spent the weekend indentifying vessels trawling for fish at night with their gear stuck on rocks and navigating my desk round the devon coast and appear to have passed.

The hardest bit was keeping the look of pure astonishment of my face when he told me!

Now for the practical in the Spring.

Thanks all
 
[ QUOTE ]
Secondary ports are referenced to "a particular" Primary Port who's tidal curves can vary dramatically.
There is no generic tidal curve so if I've understood your question correctly....... no, you can't do it.


[/ QUOTE ]

Whilst it is true that there is no generic tidal curve, there is however a proforma available for secondary port calculations. The proforma takes the information from the standard port and easily calculates the differences of time and height for HW and LW. This information is then entered in the standard port curve and used as normal.
The link posted earlier has all the information, though ata quick glance it makes it look more complicated than it is.
If anybody needs a simplified version and how to use it, please PM me and I will be happy to forward this.
 
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