How to practically construct a Deviation Card for the ship's magnetic compass??

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In this video, I explain the practical procedure of constructing a deviation card for the ship's magnet compass and the practical considerations to bore in mind while doing so.
Contents of this video will benefit mariners preparing for exams (written and oral examinations).
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[@mohammadshahabuddin1480]

The way of your teaching style is superb sir ....its easy to understand In a short time you explain a lots I watch your all video and cleared my exam ....thank you so much

[@90subhra]

Thank you, understood.

[@donaldbagolor6777]

Thank you

[@don19759]

Very useful..

[@AlokSingh-hz9sp]

Excellent!!

[@Anilkasarapu]

And how do we do if there are no objects at all like while drifting out at sea. Bcoz we have done using only heading gyro and compass. Is it correct sir

[@Anilkasarapu]

Very nice video sir. I have a doubt sir. The heading 000 you referred it to as course in the deviation card. Is it gyro heading or compass heading? Sometimes this is mentioned as heading or course or compass in the deviation card. Why I'm asking is while calculating compass error onboard we take deviation against its compass heading from the deviation card.

[@AlokSingh-hz9sp]

Normall magnetic compass

[@joelcastillo3470]

I have the same doubt as you do. And from what I understand after watching the video, is that the course/heading on the deviation card corresponds to the Gyro Heading that the ship was making at the time of swinging the vessel to make the deviation card. So, in order to get Deviation for compass/gyro error calculation on board, you would get the Deviation value that corresponds to the Gyro Heading that your vessel is making at the time of your calculation.