In case this is not the right forum for the above subject, please bear with me and direct to the right one.
I am getting ready for RYA Yachtmaster Offshore
exam and have some _theoretical_ questions regarding tides and passage
My first question is about the right way to do tide height interpolation. The following example is taken from RYA Training Almanac (fictional waters):
plan: from Bramhope Creek to Farlow River, Tuesday 28th May
Standard Port for Bramhope Creek is Victoria: time Zone UT, add 1 hour for summer time
Tide Mean Ranges: Springs 4.9 m, Neaps 2.4 m
Tide Heights at 28 May Victoria:
LW 0509 0.6
HW 1125 5.5
LW 1731 0.8
HW 2343 5.6
We are almost at Springs, range 4.9m, 4.8m
Time diffrences for Bramhope Creek:
Victoria High Water
Differences Bramhope Creek
1) In our case HW at Victoria is at 1125 while difference is given for 1200 and amounts to +0006. Though time difference is very small, yet for my understanding it would be intresting how to interpolate time difference in this case. So we have 1125 between 0600 and 1200 times:
0600 < 1125 < 1200
-00006 ? +0006
Time intervals in minutes:
0600 --325min-- 1125 --35min-- 1200
So 1125 splits time interval in two parts
in ratio 11/12 : 1/12 approximately.
Now looking at time differences I have questions:
2) What is the length of [-00006, +0006] interval, is it 12 hours?
3) In what ratio should I split [-00006, +0006] interval?
Thanks for your help!