Captain George Vancouver, tutored by Captain Cook, sailed 65,000 miles, never lost a man to scurvy, charted all the west coast of Canada and Hawaii, with only a sextant. Incredible sailors back then.

@nostradamus7648

Жыл бұрын

His first mate was a very young Cap'n Crunch

@ianbruce6515

9 ай бұрын

Both Vancouver and Bligh were proteges of Captain Cook. Unfortunately for them, Captain Cook came from a time when it was possible for an ordinary seaman could rise to the post of Captain, even Admiral. By the time the careers of Vancouver and Bligh got started, the British caste system had pushed it's way into the navy. Bligh had a particularly hard time of it, struggling to gain the respect of his upper class officers. The army officer corp had always been the preserve of the hereditary rulers of Britain. When the prestige of the navy increased, they moved into the navy. The descendents of the Normans who conquered Britain in 1066 and had held their conquered lands and all the positions of power over the centuries, now saw the navy as important as the army.

@johnstonewall917

9 ай бұрын

Clock?

@philgray1023

9 ай бұрын

​@@ianbruce6515Commissions were bought all along. Not a lot of difference in the 70s either. If you went to the right school (paid) you would have a much higher chance of a commission. I was in with guys who were brilliant (based on IQ tests) and they had to rise up through the ranks, whereas I never met an Eton old boy scrubbing the decks. And yes we actually did that. A very rare beast then was a Commander who had started off as an ordinary able seaman. He was regarded with awe and fear because he was an unstoppable force with total iron discipline.

@g.jeu.2187

9 ай бұрын

Who invented the sextant ? Who made the sextant in production ? Who thought the first sailor man ?

twenty thousand leagues under the sea brought me here 🤣🤣 i was curious to know how to operate the sextant and once again, thanks to KZread, I’ve gained some knowledge that I may never use in real life !

@kaan_isik

2 жыл бұрын

That would be me as well, the Walter James Miller and Frederick Paul Walter's translation, right?

@malthus101

2 ай бұрын

simply buy a sailing yacht for $500,000 and head off to sea. Then you'll be able to test your sextant knowledge. Problem solved - simple!

While I'm sure undereducated sailors burning their retinas out contributed, I'd always learned that the eyepatch was a primitive form of underdeck preparedness: sacrifice a little bit of peripheral vision for instant access to low-light vision when moving quickly between decks. Even militaries teach to keep one eye closed when operating in between the bright sun and indoor locations for extended periods.

@us3rG

2 ай бұрын

Covered eye also works better at night

Love this, love this channel, and really appreciate your commitment to this sort of VERY high quality educational programming. 11/10, am binge watching them all. Thank you.

This was still used in the US Navy in 1956. Every day, the destroyers in the screen around the aircraft carrier had to send in their positions calculated using a sextant. One day, one was hundreds of yards off from all the others. The officer responsible was told to "do it again". I know, because I sent the message.

@richardbloemenkamp8532

9 ай бұрын

Did you send the message with the wrong position or the message telling the officer to do it again? It sounds like a nice story but it is actually quite confusing. It also begs the question whether it was much better the second time and what had gone wrong the first time and, of course, whether there was any punishment or correction and whether you feel you had any responsibility.

@fredrichenning1367

9 ай бұрын

@@richardbloemenkamp8532 - The second attempt was "in the group", so acceptable. I don't know if the officer got a slap on the wrist or not. Why should I have had any responsibility? I was just the radioman. both sending and receiving PS. Our destroyer was the command destroyer of the squadron, which is why I was involved at all. Actually, this made my job quite interesting, since all the info back and forth flowed through us. The radio gang was the most "informed" bunch on the ship!

@richardbloemenkamp8532

9 ай бұрын

@@fredrichenning1367 Ok, thanks for the information. That makes sense. Of course as are radioman you are not responsible, but I can imagine that with certain messages you know that there can be severe consequences for individuals. Probably not the case here.

@fredrichenning1367

9 ай бұрын

@@richardbloemenkamp8532 - The thing that amazed me was that they put their positions reasonably within a hundred yards or so just using a sextant -- in the middle of the whole damned Pacific. Shackleton would have nodded approvingly, I bet. BTW. Where possible, we used LORAN, of course. As a radioman (AND "captain's talker"), I spent a lot of time on the bridge hobnobbing with the officers. Even steered the destroyer once for five minutes, 'cuz the helmsman had to go take a piss (nobody else was on the bridge just then, LOL). Interesting times!

Хорошее объяснение. Я пользовался им для определения места корабля в море,когда учился в высшем морском учебном заведении. При походе вокруг Европы. Определял по нижнему краю солнца,луны,звёздам. Важно знать точное время,ведь земля за 1 секунду поворачивается на 400метров. Вычисления занимали 30минут. Много разных нюансов. А изучали работу с ним на случай,если GPS отключат.

Thank you, always wondered how the heck this thing works and you delivered in great way. Also, loved the insight about why pirates wear an eye patch.

2 жыл бұрын

kzread.info/dash/bejne/pIh1mNGcqaqaeaQ.html

@skhotzim_bacon

Жыл бұрын

Well it's not the only reason. Another reason for an eyepatch is to see better in low light environments such as below deck

awesome vid. Pirates wore eyepatches to have one eye they can use in the darkness of the hull. there was only one navigator per ship.

2 жыл бұрын

kzread.info/dash/bejne/mHyj2tiLesi3aag.html

@Nyxra

2 жыл бұрын

I dont think that was really true. Pirates probably wore eye patches for the same reason anyone else did. Not to mention being around explosions involving wooden splinters flying as shrapnel, its even easier to assume an eye patch was worn to protect a wounded eye form the sunlight/dust etc.

@lostboys-sailingteam576

2 жыл бұрын

True about the eye patch, but the number of navigators on board depends on the ship it was. In the british navy for exemple, there is a master that is responsible but all midshipmen would take sights throughout their watch and all lieutenants and supperior officers were supposed to keep a log with their personnal sights and estimated position. In the merchant navy, before precise chronometer, they would only be able to know lattitude so they would sail to the lattitude of their destination and then head west or east. The captain, first officer and master would all take sights at noon. It wildly depends on type, size, and purpose of the ship and on the period.

@jackster2568

Жыл бұрын

I see, whereas the everyone else used fluorescent lighting in their vessels to remove the need for eyepatches?

It would be nice if you had mentioned the whole point of a taking a sight with a sextant in the first place, that measuring the height of a celestial body like Polaris or the sun above the horizon can be used to determine your location (latitude and longitude).

@alangreen4156

Жыл бұрын

Where sextants around before ships clocks?

@rayopeongo

Жыл бұрын

@@alangreen4156 Yes. Sextants could always be used to measure latitude accurately. The ship’s clock made them very accurate for determining longitude as well.

@karhukivi

Жыл бұрын

@@rayopeongo Before ships' clocks it was possible to determine longitude approximately using "lunars" i.e. the angular distance between the Moon and a known star or sometimes the Sun.

@karhukivi

Жыл бұрын

@Joël With Polaris, only latitude.

@rayopeongo

Жыл бұрын

@Joël Latitude is easy with Polaris, or sighting on the noon day sun. Figuring out longitude is much more difficult, and requires a very precise clock. That is why the British parliament offered prizes for anyone who could invent a chronometer that was precise enough for determining longitude. en.wikipedia.org/wiki/Longitude_Act

*Very nicely explained and most elaborate information...... Thanks a lot, Brother 🙏*

I totally regret watching this while hammered..at some point in my life I'll totally need this info

@avatar1867

3 жыл бұрын

I hear you can make a makeshift one with paper and string? Something like that. Better get on it! You gatta know where you WHERE in order to find out where you ARE, so when you're lost, you know where you ARE, because you know where you were!

@kaan_isik

2 жыл бұрын

@@avatar1867 We're not in the Nautilus, captain. Use a GPS or smt

@SimonTekConley

2 жыл бұрын

Harbor freight, $22

@SimonTekConley

2 жыл бұрын

Also, yeah, i get afraid when things randomlt come up, like, why am i going to need to know this., i don't want to be in that situation

Absolutely LOVED this video. Amazing. Thanks.

Brilliant series. Thank you!

Awesome animation as well as explanation. Thanx man for the effort.

Thank You......never knew the details of this device .....This is how they mapped the old world ......

Excellent video, thank you.

just amazing....in hope to see video on ECDIS. love from INDIA

The explanation was splendid😊 I love it❤.

Thank you so much for this very usefall explaination

2 жыл бұрын

kzread.info/dash/bejne/pIh1mNGcqaqaeaQ.html

One of the best channel on youtube!

I'm watching this because yesterday I watched the Sylvester Stallone's movie titled: "Escape Plan" and a sextant was used there. EDIT: Thanks for the likes and the comments. 😽

@koski7579

4 жыл бұрын

Lol same here

@magnumbers9255

3 жыл бұрын

Same here

@gusthemagickbus7256

3 жыл бұрын

Same!!

@gusthemagickbus7256

3 жыл бұрын

And I found one on Amazon!

@tomasrauktys5746

3 жыл бұрын

me to😂

fantastic presentation with visualization.

2 жыл бұрын

kzread.info/dash/bejne/pIh1mNGcqaqaeaQ.html

Great presentation, nice an clear

Your animations extra ordinary

Very intersting as a former mariner. Not sure about the sailors eye patch theory. They covered one eye to get acustomed to dark light and one for daylight. So you got acustomed to it, before going on watch at night.

Me@ midnight: Think I'll turn KZread off and go to bed. KZread: But do you know how to use a sextant? Me:........ Go on....

Excellent presentation and much appreciated ... Thanks. God bless the British. You sound like Professor Brian Cox. Sure beats the cocksure, can-do alternative. Greetings from OZ.

I'm definitely too dumb for this.

@user-fi3qb8dk9f

20 күн бұрын

Ig thats true for a lot of us

@1unawesome644

8 күн бұрын

No friend you just have to learn some basic principles and by basic its math.. the US has made people hate math because it is the humans universal language and they don’t want us to have that knowledge

@malthus101

8 күн бұрын

@@1unawesome644 could well be true...

Not sure why I ended up here, but I truly feel like these methods of understanding how to navigate our blue planet in relation to celestial bodies shouldn’t be a lost art

thanks you for your nice video

Thank you for that ,Just learning. My Father said to many times at sea Captain cook Didnt use Radar GPS

very informative

better than the how to calculus vids. I understand this

That was excellent!

Thank! Really found your explanation very helpful. No one else explained it so completely as you did from what I’ve found. Just one question. Why is it (I+I) + 2x and not 2I+2x? Thanks

@kaan_isik

2 жыл бұрын

In math it doesn't really a matter, so you can also call it 2 I if you'd like to call

And i thought pirates wore eye patches to cover a missing eye that was wounded in a sword fight.

@nadiakhan7487

4 жыл бұрын

thought the same LOL

@evilskills

4 жыл бұрын

That information is actually wrong, below deck in old ships you would generally not see very much in the middle of the day because its really dark down there so they would use an eyepatch to cover one of their eyes so they don't have to wait for their eyes to adjust

@ge200099

4 жыл бұрын

@@evilskills That's very interesting! Thanks for sharing!

@fakenamefakename12345

4 жыл бұрын

Pontus Eriksson Yep you got it. I was gonna say the same thing!

@codyleslie478

3 жыл бұрын

@@evilskills mythbusters

Do you have a source for me regarding the "eyepatch because sextant burns" topic? Don't get me wrong, I'm not trying to "um, actually ..." you, but I only ever heard they were for adjusting to the darkness below deck more quickly. I'd like to educate myself a bit further if there were multiple reasons for eyepatches :) anyway, great video, thanks!

Thank You ! !

EDD: Yes, well, it's all fun and games but merrymaking nearly cost us this sextant. (Eddy snickers) EDDY: You catch that, Ed? Uh... the what? I missed that! What's it called? EDD: It's called a sextant, an astronomical instrument used to... (Ed and Eddy snicker) EDDY: Again? Sorry, I missed it... what's it called? EDD: It's commonly known as a sextant, Eddy... (Ed and Eddy burst into laughter) ED: SAY IT AGAIN, DOUBLE D! (Edd realizes what’s Ed and Eddy are getting at and blushes.) EDD: Oh my!

@williamminyard5517

3 жыл бұрын

Clever.

@systembypass6930

2 жыл бұрын

I miss that show. Some of the last of the great cartoons.

@nostradamus7648

Жыл бұрын

Beavis: You said Sextant Huh, huh huh huh huh. Huh huh huh huh Butthead: Shut up, Beavis

It's a great and very informative video. I never thought that sextants are used in that way. Do sailors still use sextants nowadays or you rely on gps more often?

@harbourdogNL

4 жыл бұрын

REAL navigators know how to use a sextant, whether they use it or not.

@huehnerfrikassee

3 жыл бұрын

Most probably rely on GPS, or atleast the ones I know and me myself do. However, you must always be prepared for it to fail, so you generally know how to navigate without any electronics and such

@kaan_isik

2 жыл бұрын

@@harbourdogNL Damn, calm down man

@pabloricardodetarragon2649

9 ай бұрын

A good sailor, even with the very useful GPS, has his sextant, the HO249 tables, and a few little items to be able to navigate old way in case of.

Thank's to sharing

Awsm vedio

Narrator: Luckily it's a LOT simpler than it looks.. Also Narrator: we're gonna have to break it up into 3 tutorials. .... fuck.

Good job

Now I'm ready to jump in my sail boat and sail across the Pacific. Very interesting.

Excellent

Never heard any explanation but this is exactly what I thought the first time I saw one.

That is incredible

Thank you. I am here because I was just curious.

perfect

Planning on using one of these for night vfr these monts,lets see how itll go

I was watching Doctor stone and Senku made the sextant. I was wondering how it worked!!!

@kingdomnate6906

3 жыл бұрын

omg i love doctor stone and am here for the same reason lmfao

@silver3766

3 жыл бұрын

Same lol

@hendihart5195

3 жыл бұрын

we gathered here for the same reason

@chris-yx7vx

3 жыл бұрын

sameeeeee

@thekmmaster4149

3 жыл бұрын

Same

PERFECT

Thanks for the topo

God damn I love this video.

Major nerd-gasm! I love this kind of content!

I took a geography class to learn the datelines, and maybe use a sextant.

@fyoozhn

2 жыл бұрын

this is the part where i shut up and let you infest my brain

Time to prepare for the Apocalpyse ! Navigation won't be a problem now

...wasn't the eyepatch mainly so you retain low-light vision in your other eye when going below deck in combat situations?

Great

No old sailor wearing a eyepatch is because older sailboats was harder to light below deck you don’t would like to use a candle next to a barrel of Blackpowder and to refracting sun light below the deck was hard and someone maybe working on deck a block the lens and port hole was not used as much because of the price of glass and the fragile if it. And yes sometimes they use eyepatches because of damage to the eye but just because they looked at the sun with a magnifying glass it should look the same as the other endless they was too stupid to feel the pain of the sun trying to eat their eye on fire and that is most likely impossible. But in battle flying pieces of wood could hit the eye but a sextant damaging the eye so bad that the man had to cover it I think not. But to keep one of the eyes adopted to the dark for going below the deck ok. Now if you cover one eye it maybe easier to handle the movement of the rolling sea without getting sea sick. If you want to get sick fast on a boot use a pair of binoculars with two eyes and look at the horizon to long you will be feeding the fish.

I just watch this video to listen to the guy talk.... It's relaxing.

Aren't the eye patches for when sailors go below the deck? Since it's pretty dark below, they wear an eye patch so they don't have issues with visibility both outside the deck and inside.

@dogwalker666

2 жыл бұрын

Yes that's what I was taught.

@hernerweisenberg7052

2 жыл бұрын

I thought it was the other way around - so that at night, they can take a peak at some charts in the cabin with candle light and go back on deck, lift the eye patch and see in the night without waiting for the other eye to adjust ;)

@gubenuben2

2 жыл бұрын

@@hernerweisenberg7052 maybe both?

@kaan_isik

2 жыл бұрын

You really think a ship that cost with hundreds of millions dollars can't provide a simple oil lamp? I mean really? :|

Why am I watching this at two in the morning?

@existentiald562

3 жыл бұрын

Well im watching at 4 in the morning

@mattsupertramp6506

3 жыл бұрын

I don't know are you lost at sea?

@ghostfrost999

3 жыл бұрын

@@mattsupertramp6506 no, i was sleeping on my bed

@ghostfrost999

3 жыл бұрын

@Fermentum Mobile if lost at the sea you mean lost at the ocean of dreams, well yes 🤣

appreciate the explanation, but in 06:15, I did not get the idea. You said "the angle between the incoming and outgoing ray of light [(I+x)+(I+x)] is twice the angle between the mirrors [(x)*2=2x]", which makes 2*(I+x)=2x, and apparently its not right. It should be the angle of the ray of deflection equals to twice the angle between the mirror. The degree of deflection is 2x.

Is the sexant that Harbor Freight sells for $20 usable or just for decoration?

@BobbieGWhiz

4 жыл бұрын

Mike Kennedy Just decorative. Many similar on Amazon and eBay. They also are very small, but look nice on a desk. A navigational sextant has to be made very precisely.

This should be MADITORY learning for flat earthers!!!

@robertlafleur5179

9 ай бұрын

They will still say nuh-uh.

Love this video, however I always heard that sailors and pirates used the eye patch to be able to go in dark rooms and below deck without having to wait for their eyes to catch up.

@georgegilkey8751

4 жыл бұрын

except that your eyes have reflex where the pupils dilate and contract symmetrically in response to light.

@mk-1579

4 жыл бұрын

I think they implied that they had their eyes burned from constantly looking at the sun

@primenumberbuster404

2 жыл бұрын

@@georgegilkey8751 nope

Don't worry, i'm a master of the Sex Tent. Oh. You said _sextant?_ Never heard of it.

Dr.Stone!!!!!!

how does the altitude reading help in navigation. so you fix on a star with altitude of 12.51 degrees , how does that reading tell me my position

@robertlafleur5179

9 ай бұрын

Let’s say you take a sextant reading on a star with a height observed of 12.51 degrees, Ho = 12.51 at some unknown location A. You carefully noted in a logbook for how many hours you sailed, your speed and direction. You deduct from your logbook that you should be at location B. Location B could be the same as location A where you took a sextant sighting but you can’t be sure because currents could have pushed you out of your way, your speed was not exact, etc. You calculate what the sextant reading of that same star would be if you really are at location B. Let’s say the height calculated is 12.0 degrees, Hc = 12.0 You then compare Ho = 12.51 degrees with Hc = 12.0 degrees. Since Ho is larger it means location A is closer to the GP, geographic position of the star, that’s the point the star is right over on Earth than location B. The star looks higher so you’re closer to it. If Ho is smaller than Hc then location A is farther away from the GP of the star than location B. The star looks lower so you’re farther away from it. This gives you a line of position perpendicular to the azimuth of the star that you can cross with a sextant sighting to another star, another calculation and another line of position perpendicular to the azimuth of that other star. That is the general idea taking sextant sights for celestial navigation.

Despite the flat earther's claim that a sextant can only work on a pancake, no flat earther has ever shown how it "works".

@karhukivi

Жыл бұрын

It can't work as all the calculations are made using astronomical determinations of Sun, Moon, planets and star positions which derive from a rotating spherical Earth.

@EternaL1fe

Жыл бұрын

@@karhukivi Is there any evidence to this, or is it just a theory?

@karhukivi

Жыл бұрын

@@EternaL1fe The evidence comes from astronomical observatories, astronomers, and hundreds of thousands of navigators who use and have used celestial navigation for the last three hundred years. Every space agency in the world use this data, as well as topographers and geophysicists and geographers who study the planet. By the way, a "theory" is science is not some notion from a magazine, it is a well-tested set of observations and predictions backed up by mathematical reasoning and widely-accepted by knowledgeable people.

@A_J502

Жыл бұрын

@@karhukivi Very well said. Basic navigation doesn’t work on a flat earth.

@annabellethepitty

Жыл бұрын

I was in the US NAVY a good friend of mine was in the department that handled navigation on the ship we were on. He showed me how to use a sextant. We wrote the math out both ways and it does not work if the earth is flat. So in short, we know the earth is round because we can navigate around it with the stars.

la naza probo uno expasial en progama lansadera de trasvordadores

This video is great, but there is a low frequency hum that is very distracting.

Was also sold as 'The eyepatch-making machine!'

se usa para orientarse los navegantes

Plastic sextants are also much lighter than metallic ones. If you ever used a sextant in heavy or rolling seas you know what advantage this is 😊

I watched intently all of your videos on operating a sextant. I just have one question ! How do I use a sextant to locate position ? 😢

@marcg1686

2 ай бұрын

A sextant doesn't determine what your position is. It measures an angle.

Thanks. Great animation and you are well spoken. Why do you need two mirrors to demonstrate this? Imagine the sun directly above your head and you holding a mirror flat, 45 degrees above your line of vision. Then rotating that mirror 45 degrees from the horizontal towards you. The light would hit the mirror at an angle of 45 degrees from the normal and of course reflect off at the same angle. Through shades you would see the sun. Thus with one mirror only, you would see an object which is 90 degrees above the horizon. It’s not a sextant, but it still halves the degrees of rotation compared to the angular height of the celestial object.

@Ben31337l

Жыл бұрын

You do realise that with only one mirror the image of the sun would be upside down, right?

I've taken the liberty of creating a playlist for this series: kzread.info/head/PLetA5Fi4kpULSexPc4Xul4Uq-8HoqifOd

If it's for entertainment purposes and there's educational information in it then just ignore the educational information and enjoy the video. 🙂

Is the mirror on the arm supossed to be straight with the arm, in the animation, it seem to be at an angle

@robertlafleur5179

9 ай бұрын

It is at an angle so that when the index arm is on zero degree the two mirrors are parallel. The animation reflects how real sextants are made.

@ryanbeard1119

9 ай бұрын

@robertlafleur5179 can you show the mechanism of how the adjustment screws take actually work in the context of the frame?

@robertlafleur5179

9 ай бұрын

@@ryanbeard1119 There are screws on the back of the mirrors for slight adjustments. kzread.info/dash/bejne/gneX05OneLy2g5M.htmlsi=85A9mC0E3e25oalc

Anyone else notice at 0:42 the joke about needing to be able to use the sextant when your mad.

I still can't figure out what are you trying to read with the sextant?

@WorldWokeApeCult

9 ай бұрын

You read the angle between the horizon and an astronomical body.

How in the hell did someone ever figure out how to make a sextant in the first place when I cant even understand it after watching a video?

I have this one..

jump to 6:15

3:43 This part was the most surprising thing to me...

Oh yeah, Sam Witwicky brought that to class.

Isnt (I+I)+2x just 2I +2x?

I didn t understand shit but I loved the video.

si estuvo en los mares del sur oceano pasifico

How was it created? Never mind learning how to read it how did anyone ever figure out how to build it.

@WorldWokeApeCult

9 ай бұрын

There were earlier forms. If you’re interested, look up cross staff and back staff.

Imagine the unnamed genius who invented this centuries ago

My ancestor invented this device

@dogwalker666

2 жыл бұрын

Honestly? You are related to John Hadley cool you should celebrate the 290th anniversary this year!

@truelyfine

Жыл бұрын

He’s an ancestor to a lot of people. Most who don’t share his name. 👍

SAY IT AGAIN DOUBLE D

@BalboaGoku

Жыл бұрын

Oh my!

Instructions unclear. Was aiming for the virgin islands but ended up on the island full of minecraft youtubers in their 30s. ...which actually means I reached my target. Jokes aside, nice video!

👍👍🇧🇷🇧🇷

Thank you. Which kind of sextant did you refer to in your video? I'd like to buy one, but the prices are all over the scale.

Hellloowww! Um...helloowww. I'm lost. ...that part about errors...