How to Use a Slide Rule on a Watch | Breitling Navitimer

Have you ever wondered what the additional numbers on the bezel of a Breitling Navitimer watch are for? They are a slide rule and they are great for everyday calculations. Here at Crown and Caliber we take a minute to explain its functions and some good ways to use it.
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[@KevinHuangPhasorQuantaG]

I'm trying to learn how to use this to justify buying an aviation watch 😂 Great video, very helpful!

[@jsn1970]

Hi Kevin, I've been there, done that. I went for a 48mm GMT version and held it, but onfortunately I couldn't properly read the small numbers in the dial of the slide rule. It still is a fantastic watch and actually you should buy, just to have it!

[@TheGelatinousSnake]

Sure. If you are ever in a situation you need multiple answers from one ratio... a slide rule will be faster than a calculator. Once you set the ratio on your watch, all possible answers to a question involving that ratio are displayed. A calculator can only show you one answer at a time.

[@attila2246]

The best way to learn is from doing so buy the watch and figure it out on there 😉

[@schlagi1]

Also, regarding unit conversion of miles to kilometers, the Navitimer already provides preplaced conversion markers for nautical miles, statute miles and km. In your example, you could line up the number of miles (land miles) on the moving scale wth the red arrow marked stat on the dial (between 35 and 40). Read the corresponding km value off opposite the small arrow marker for km (at the top of the dial). Your way is correct too, of course, you just need o remember the conversion factor when the dial is already set up to help with that.

[@normchristopherson5799]

I am 72 years old and learned my math on a linear slide rule. It is amazing what math can be accomplished with the slide rule. We put a man on the moon using slide rules. I purchased one of the very first electronic calculators made. I currently have a personal slide rule collection along with the instruction books that came with them. Even have some of the original packaging.

[@timharig]

0:37 You don't have to know what your answer will be and you do keep track of the decimals. Basically, you are doing your calculations using scientific notation. If multiply the two numbers a×10^b and c×10^d the result would be (a×c)×10^(b+d). The slide rule can do the a×c part for you but you have to keep track of the decimal by adding b+d yourself. Also, if your answer goes past the 10 you have to add an additional power of ten to keep it in scientific notation.

[@robertsullivan4773]

I have the new Breitling ref 806 1959. Here is the thing. At 40mm you have to have the eyes of a fighter pilot to read the small scales. It's why the navitimer had traditional been a big watch so it can be seen in a cockpit. Bottom line my smart phone has a tip calculator. I'm pretty fast with it. But thanks for your lesson. Enjoy your vids.

[@bobbysebastian3709]

Thanks 🙏 for the educational video on slide rule in Breitling navitimer

[@nimaemami9650]

Awesome video with great details! 😊

[@Claude1100]

Thanks for posting.

[@robrobertson1458]

cool..thanks!

[@paullin5172]

hi, may I know how to drawing that meter for both inside and outside?

[@victorrodriguez9171]

Osom!!

[@Flamer997]

On my watch, it has KM on just past the 12 on the inside ring and I went online to a converter and put on 60km and found it to be 37mph ish and I found on the outer dial where that number would be and it had the word stat on the inner dial and so I kept messing around it using stat always went to km so it got easy for me to convert it

[@jasongeorgisdaniel]

I need to learn how to fly now, easy peasy 😜

[@Loksta112]

20% tip on 400 bucks. This guy is generous

[@codycurnutte9778]

This is handy if you can memorize conversion rates. Otherwise all this is good for is percentage calculations.

[@user-bw6bz2xy1f]

Thank you for the helpful explanation. One suggestion. The loud overlaid music makes it difficult to follow. Please consider dropping the music when speaking, or have a separate video without competing music.

[@BroAriq]

Im gonna use this when i fly my Boeing 777-300ER (in MSFS)

[@eryud]

Why this version without (Swiss made) written ?? No on face or behind 🤔

[@eurekaakerue4649]

*❌✅ Mine is quartz movement and only says on back band an clasp // probably a quartz faze model , not automatic not as expensive , but will keep time far better $5k not $9k plus // cool factor better than a Rollie 😎👍 **_MODELE DEPOSE // MANUFACTURE EN SUISSE_** how (Breitling) spells it ✅* translated designed in France 🇫🇷 Manufactured in Switzerland 🇨🇭

[@redpillsociety6479]

I could use this on my next math test, does it do division?

[@timharig]

Yes. A slide rule is simply two logorithimic scales. Multiplication works by converting the multiplication into addition accordance to the identity log(ab)=log(a)+log(b) the scales are log(a) and log(b) and measuring the distance with a log scale does the antilogarithm to get ab. Division works the same way but using subtraction: log(a/b)=log(a)-log(b)

[@robertsullivan4773]

You should know the SR71 Blackbird and the Saturn Rocket were built by engineers using slide rules. So yes they do division.

[@pubgplayer1720]

@@timharig Ah, good one. Now I understand truly how the slide rule works; before I was just like "What is this sorcery?"

[@secretagentmandanV2]

So the speedmaster bezel is practically useless aside from calculating speed..

[@Omil7750]

Excellent video, just less music please.

[@nightwinddemon]

WHAT THE HELL?? You barely scratched the surface of the slide rule bezel!!!! What about Time/Speed/Distance calculation? Multiplying/Dividing/Currency conversion? Ratios/Rule of three? Square root? (Okay this one is not exactly one of "everyday" calculations, but everything else above is!) By the way, slide rules on cheaper watches often have quick unit marks for unit conversions, like km to miles to nautical miles, lbs to kg, liters to gallons, etc....

[@timharig]

The scales are simply two logorithimic scales . They allow you to do multiplication and division: log(ab) = log(a) + log(b) log(a/b) = log(a) - log(b) What you do with those two operations is up to you. It could be currency conversion, it could be time-distance calculations, whatever. Its all just multiplication and division.

[@GospodinJean]

A dinner that costs 400 dollars? Lol

[@tonyl7000]

I mean... $400 isn't much especially if it's a big group... and considering the types of people that buy luxury watches, 400 isn't that bad.

[@GospodinJean]

@@tonyl7000 precisely. and that is why this watch is no for me

[@tonyl7000]

@@GospodinJean 10-15 people...​ imagine sitting down, eating, and mingling for hours. Getting to 400 total isn't strange.. even at the cheapest of restaurants.

[@paulchandler427]

T Y Simon Cole . I was following along w/ speaker (several times) My "18" inner was just over "11" on outer scale (aprox 11.2 / 11.25)

[@simoncole3943]

In the second example, converting 180 kilometres into miles, the answer given in the voiceover and on screen is wrong. The 18 on the inner scale is aligned with a little bit less than 11.2 (and not 12 as the speaker says). This corresponds to a little bit less than 112 miles and not 120 miles as the graphic on the left states. The speaker then confirms that the maths give an answer of 111.8 miles, which is indeed a little bit less than 112 (but a lot less than 120). Come on guys, it's not THAT hard!

[@kaiserphoenix01]

Lost me at dinner for $400 lol

[@Johnfsu]

People still need tip calculators? Just move the decimal on the cost, and double it. Jesus these comments are scary. How can you afford a Breitling and not know this?

[@Pax.Britannica]

Na, should've multiplied 420 by 69.

[@clegsmegson2627]

I'm the CEO of a large multinational - let's say money is not a problem for me. I drive a G63 Brabus daily and my 488 on the weekend. This watch would not even enter my periphery. Who else agrees? Best regards, Cleg Smegson

[@stufftimdoes6327]

Cleg Smegson piss off snob

[@bloodyfx1065]

Watches are not about status, though people incorrectly use them as such. Watches are all about the engineering and the mechanism of them. We, watch enthusiast, do not like watches simply because of status or money but rather because we love how they work. This slide rule watch might not be the best watch for a CEO of a company who simply cares about what other people think but it is an amazing tool for a pilot, an engineera mathematician, or an enthusiast who has deep love towards the science behind the watch. It's the same thing with cars, people buy Lamborghini and Masseratis but they don't appreciate the engineering behind them, just the status. For a person who lacks culture and love towards humanity's creation I would say this watch would not fall in their periphery and noy many people would recognize it as expensive therefore not being a good show off piece. Just get a Rolex, because even though you can afford a Breitling or hell, even a Patek Phillip easily, which is a more expensive watch than a rolex, no one will recognize it as well as a Rolex.

[@khoocheepeng]

I am a pastry chef, I save enough money ...