Basic Navigation Part 2

Preparing for your ASA or RYA course? This video can assist you to better understand the basics of marine navigation. This time round, we take a look at fixing our position without electronic equipment, the basis and limitations of Dead Reckoning, tides, currents, and the dreaded Rule of Twelfths. If they can do it in the Golden Globe Yacht Race, then so can we.
Part # 1 can be found at:
• Learn to Sail - Basic ...
Golden Globe Live Tracker:
goldengloberace.com/live-trac...
Theme song: (Audio Network)
Aotearoa (Mark Williams, Adam Alexander, Bruce Maginnis)
#tutorial #tutorials #learntosail #animation #navigation #gps

[@obiwanfisher537]

The animations are really helping visualise. There is nothing new here for me, but I remember how helpful I found your videos about standing rigging and running rigging and where everything goes and how it worked.

[@searchingforcoconuts2248]

as always, good to hear from you, thanks for adding value to our channel

[@sud0gh0st]

The production quality in this series is the best i have seen yet, Great work and thanks so much for the time and effort _o_

[@searchingforcoconuts2248]

amazing comments, thanks so much, and thanks for watching

[@agontop1]

Absolutely fantastic information ty

[@searchingforcoconuts2248]

amazing comments, thanks so much

[@marpenman]

I like the educational aspect of this channel!
The rule of 12ths is nothing to fear! It’s a good way to approximate a sine curve for six equal time increments, which is very close to how tides behave. In fact, it matches a sine curve exactly except at 1/12 (20% error) and 11/12 (2% error).
Another way to illustrate the water level change with time is with an analog clock face, where high tide is at 12:00, and low tide is at 6:00, six hours away. As you move around the clock, the vertical rise or fall corresponds to the water level change with time.
Example for a falling tide:
First hour: From 12 to 1, the vertical drop is small, about 1/12 of the way from 12 to 6, or 7%.
After two hours: At 2 the level has dropped 1/4 of the vertical distance (3/12).
After three hours: At 3 the level has dropped half-way (6/12)
After four hours: At 4 the level has dropped 3/4 of the vertical distance (9/12)
After five hours: At 5 the level has dropped by about 11/12 or 93%.
I find it easier to remember 1/4, 1/2, and 3/4 at 2, 3, and 4 hours, with the first and last hours being the 1/12 of slack tide.
PS, In the figure shown at 13:11 in the video, equal increments of water level are shown rather than water level for equal increments of time.

[@colorocko1]

Thank you

[@damage_control_sailing]

Thank you so much for taking the time to make us all smarter sailors. You guys do a great job at teaching.

[@searchingforcoconuts2248]

welcome back... Thanks for taking the time to post such positive feedback, much a;ppreciated

[@23Adri]

Thanks for making this! It's really well explained.

[@searchingforcoconuts2248]

most welcome, thanks for your great feedback

[@rugbopher]

Very good videos. Thank you!

[@martinlacey4575]

Thank you !

[@searchingforcoconuts2248]

thanks for the great comment, much appreciated

[@user-wb7dz5di2x]

Really appreciate your time and help! Thank you!

[@searchingforcoconuts2248]

amazing feedback, thanks so much

[@larrygordge2688]

Thanks ... appreciate the content very much.

[@searchingforcoconuts2248]

thanks so much for these great comments, makes it all worth it

[@lindsayfitch7605]

This is great! I'm a new sailor and this makes it all clear, thank you! More please

[@searchingforcoconuts2248]

fantastic, great to hear, thanks for the feedback

[@tinanewton-modlmayr1342]

Brilliant clear explanations and imagery! Thank you.

[@searchingforcoconuts2248]

thanks so much, awesome comments... have a great New Year

[@allandoyle1809]

Wonderfully explained. Merry Chritmas & Haapy New Year

[@searchingforcoconuts2248]

Thanks so much. Wishing you a fantastic festive season and a great new year ahead...

[@flashladderacrobat]

Thanks a lot for for this , it's well explained , first class mate!

[@searchingforcoconuts2248]

that's so good to hear, thank you

[@steveriley1952]

This is excellent... thank you for making this it's been very clear and concise and helped me a lot

[@searchingforcoconuts2248]

thanks so much for watching and adding fantastic comments, much appreciated

[@armorguy1108]

This might be the best explanation of the Rule of Twelfths I have seen. My Grandfather tried to teach me this some 45 years ago and 10-year old me just did not get it. Thanks for helping me understand.

[@searchingforcoconuts2248]

what a great way to start the morning, thanks so much for such positive feedback and great to hear the explanation was understood. Highly motivating and much appreciated

[@harbourdogNL]

These are such valuable videos, thanks so much. Really clear, terrific graphics, and very methodical.
I'm rooting for Kirsten! She bought her boat where I live, Newfoundland, it used to sail out of one of the yacht clubs here, so I'm biased!

[@searchingforcoconuts2248]

thanks so much for the great comments. I too am biased I guess, Kirsten has had a few great days and is looking good, even after the rescue

[@FortuneSkies]

Hi. Thank you very much for this clear and informative educational videos. Do you plan to continue the series?

[@searchingforcoconuts2248]

thanks for your kind response, much appreciated. Am trying to find time to get to the next one

[@monikabazyl387]

I decided to learn some basics because I just watched "Adrift" movie

[@searchingforcoconuts2248]

let's hope we never find ourselves in those conditions

[@vincentmiceli2554]

Sir Robin KnoxJohnson officially crossed the finish line first but only because Bernard Montissier decided to forego finishing and just headed back out for a second trip around Sir Robin has gotten all the accolades but Bernard Montissier proved he was the best sailer in the world, at that time

[@searchingforcoconuts2248]

Thanks for those interesting points, much appreciated

[@trinitywave]

This was was very helpful too! Great education. I listened to this the first time through, and I couldn't understand the barrels but then the 2nd time I watched the video and understood more. So the "slack tide" just means the time in the cycle between low and high tide when there is less fluctuation in the amount of water, therefore it's calmer, correct? And was there a suggestion this is a better time to "set sail"(?) because of this? Was a little fuzzy about that part and the reasoning why. Do you suggest doing this high tide low tide barrel ranging calculation before each time setting sail?

[@searchingforcoconuts2248]

Hi, first, thanks for watching and contributing. Slack tide could be high tide or low tide, refers to the exact time of the high or low tide, where less water movement can be expected. Not necessarily the best time to sail, but definitely the best time to go through any kind of channel or in confined areas. In areas where tidal range is very high, the amount of water could be important. For us and where we sail, it's just important to know that around 3 hours after or before the last slack tide, is when we will experience the most water movement.