Navigation Theory - Secondary Ports

A demonstration work through of a secondary port tidal calculation

[@acuity139]

Very nicely done. Very clear and easy to follow. Just starting out on the theory. And watching you run through it, certainly helps Thank you

[@Londonschoolofsailing]

Thanks very much I hope to do more although this summer has been so busy on the water we’ve not had time

[@lukeharris5130]

Thank you for explaining that I was pulling my hair out 😂

[@lyndoninch6146]

do you have any more questions i could work through

[@Londonschoolofsailing]

If you email me at [e-mail] We might be able to send you some

[@draeroheli-jw3kp]

Standard Port Colville is in TZ-1. ( Subtract 1 hr for UT ) As suggested in this factitious RYA Almanac book, Do we have to Subtract 1 hr from your calculation and then add 1 hour for Day Light Saving Time? SPDST means South Pacific Day Light Saving Time. SPDST., therefore you add UT+1 I noticed that you have written TZ-1/ UT+1 in your note. I am confused.

[@Londonschoolofsailing]

So if the standard port is in TZ-1 (or UT+1, as they mean the same thing), then you do not add on the hour for DST (or SPDST) until you have done the HW/LW time conversion for the secondary port. Hope that helps

[@ramiznewarekar8346]

ha bacha hua kal bol de