How To Calculate Compass Error by Azimuth of a Star

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How To Calculate Compass Error by Azimuth of a Star! A short video where I explain how to calculate a ships Gyro or Magnetic compass error from a bearing of a Star in this case Arcturus, by calculating the direction (or azimuth) of the Star.
Ask any questions in the comments - I’ll do my best to answer them.
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NOTE: This video makes use of selected pages from the British Admiralty Nautical Almanac (Admiralty Publication NP314). The example uses the 2016 version of the publication so if you’re doing the calculation for a different year the numbers won’t be the same.
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Opening Tune: Good Starts by Jingle Punks
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Опубликовано:

11 май 2016

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Комментарии : 25

@AlistairBaillie 4 года назад

If you're getting the wrong answer when entering the formula into your calculator I've created a short video here which explains what you are probably doing wrong and how to fix it: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-0YnFY4NGaR8.html

@blackpearl7584 2 года назад

Great video ..Sir can you pls show when calculating by Star haw to use admiralty sight reduction tables NP303?

@AnubhavSingh259 3 года назад

Do we have to use azimuth mirror to find the bearing of the star from bridge wings?

@melihozer3333 2 года назад

Explicit explanation.Thanks for your efford.

@AlistairBaillie 2 года назад

Glad it was helpful!

@locomojo8896 3 года назад

Hello. How can i get the bearing of a star?

@coconuts4140 5 лет назад

can i use ABC table or the ABC by calculator with these aside from that formula given above?

@AlistairBaillie 4 года назад

You can use ABC if you wish, the formula I use is based on the ABC formula but combined into a single step.

@anglers_spirit 5 лет назад

Dear Alistair, could you please to show us formula for Az in right view. I mean how this formula exactly viewing according to mathematics rules. And is it possible to show us one example with digits for finding Az. Many thks in advnce.

@AlistairBaillie 5 лет назад

Hi there, the formula with worked example is included in the earlier video in the series using the sun - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lq05HWO51Zw.html

@onyourcouchtourtv1254 5 лет назад

Where did get the gyro bearing of the star? It should be thru the gyro repeater right? Pls tell us how?

@AlistairBaillie 4 года назад

Yes, you would normally obtain your bearing through a gyro repeater on the bridge wings.

@guyrit1 7 лет назад

Does it make a difference if the Declination is south? would you consider that a negative number? and same for E? thanks Harry P.S great video by the way!

@AlistairBaillie 6 лет назад

@Harry Bould - Sorry for taking so long to reply - hopefully you've worked it out by now, but if not; Yes, if Declination is south you treat it as a negative value in the azimuth formula. If you're referring to the longitude being East, then yes, you would subtract it as the event is occurring before it would occur at Greenwich which is what everything in the Almanac is referenced too. Thanks for watching!

@fernhub 2 года назад

HOW TO LABEL YOUR DEVIATION CLEARLY I STILL GET A BIT CONFUSE

@sirlanzealot 2 года назад

I don’t understand the Variation and Deviation part, there’s no nautical chart

@ashutoshbisht9576 7 лет назад

can we use star finder for azimuth

@AlistairBaillie 7 лет назад

Ashutosh bisht no as the Star Finder only gives an approximation of the bearing of the star or planet, using it to work out a compass error would introduce a potentially huge error.

@nguyennhung47 7 лет назад

I calculate Az = 15.32. What's wrong?

@AlistairBaillie 7 лет назад

Depends what you're keying into the calculator, I've tried missing brackets and -ve signs but can't replicate that answer - it is possible you are missing one of the brackets - if you have a look at the Azimuth of the Sun video it explains the formula in a bit more detail.

@nedmichaeldoldolia6878 6 лет назад

Why is it N 74.99 E shouldn't it be S 74.99 W since 74.99 is a positive azimuth and is between 000-180? Just asking sir, I'm a bit confused.

@AlistairBaillie 6 лет назад

NedPH Hi, the N 74.99 E comes from the LHA (Local Hour Angle: 275 deg...) being between 180-360 and the result of the Az formula being positive.

@nedmichaeldoldolia6878 6 лет назад

Alistair Baillie Oh I see, thanks a lot mister.

@rezaf9835 6 лет назад

and my big question is how to get the bearing of the star

@AlistairBaillie 6 лет назад

What do you mean? Your calculating the bearing of the star using the method explained in the video? If your asking how you know what star you’re looking at - I explain the star finder in another video.