How to Calculate Tidal Streams using a Tidal Stream Atlas and Tidal Almanac
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- Опубликовано: 27 ноя 2024
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I'm a professional sailor & RYA Yachtmaster™ Instructor (Ocean) with over 35 years experience. I've logged over 250,000 nautical miles including competing in three round-the-world yacht races, twice as skipper. I circumnavigated in 2011 on an Ed Dubois designed Clipper 68 and subsequently skippered two Tony Castro designed Clipper 70's in the Clipper Round the World Yacht Race in 2013 and 2019, respectively.
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This is an exceptional site where navigation is explained pedagogically. Whether it is tides or course to steer, it all works well for me. Thanks.
Very kind. Thank you.
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Love your quick tips videos, thanks very much.
Thanks Jason. Glad they're useful.
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Well worth watching, thank you
I watch your videos several times. I am a novice sailor .Thank you for your clear explanations . one thing I did not understand at 2.30 in when you say there is a lat and long scale to show WHEN tidal streams taken .how is the time determined from the tidal atlas? Thanks
Hi Ajmal. Thanks for the question. I think my wording is not clear at that point. You can establish the tidal arrow's location from the lat and long on the chartlet. Each page on the chartlet is HW Portsmouth, +1hr, +2hr,+3hr, etc. The HW time at Portsmouth is found from an up to date almanac. I hope that clarifies?
Very helpful. Thanks.
Great stuff thanks
Excellent😀
I'm only just learning this but I do know that you shouldn't add the hour for BST until the end as it can effect the timings if calculating another port's tides using the Portsmouth tidal times.
Hi Guy. Well, as you say, you are just learning. You are right to identify that you do need to keep all the times the same and keeping everything in one time and clearly marked is important. If you were sailing to France (another time zone) then this might this might be a better way of doing it, but here we are not.
The critical point here is that if we mark any time on the chart, log or tidal stream atlas, we must make it clear what it is (i.e. UT or BST, etc) and you could, I suppose, keep everything on the tidal stream in UTC and then adjust at the end. If you are sailing a coastal passage, within the same time zone, it makes no difference as long as you know what you are dealing in.
What Guy is saying is definitely correct for calculating secondary ports. Keep the times in the same zone used in the primary port almanac table. For tidal streams, marking the atlas with or without summer time offsets does matter as long as you label and track your clock time values.
Thankyou.
My pleasure.
sailing bros using app on samsung tablet..the done all of great britian and are already in the caribbean .can someone tell me if they are taking a risk just depending on the app.
Hi. Most is not all the app providers say NOT to use for navigational purposes so you might have a problem if you had a problem and had to claim on insurance. You also need to use a decent app and keep it up to date. I always like a secondary option that doesn't need batteries.
❤
I thought this was about Tidal music stream service🙄
Fascinating.