Very good video. I am an armchair navigator and this was nice. Did you know in WW2 on Guadalcanal us forces had to use native guides because their compasses were useless because of all the iron there?
Because of the coming micronova, declination is moving much farther, and much faster and so declination information is likely incorrect My up-to-date declination is 30 degrees, 15 degrees off from the official declination for my area. but there is still a way to recalibrate magnetic declination using the shadow of sticks recording the path of the sun---rotation of the earth has not yet changed. First stick will show East. Mark it with a sharp stick pushed in. After a few minutes you can mark sun shadow travel where the shadow has moved - Push another stick in to mark West. Lay a straight stick from the E mark to the W mark. Geographic north or True North is 90 degrees from the E-W line. With your compass pointing toward True North, note how far off your compass is now. That is your true up-to-date declination. More on micronova in my 2nd book, Surviving the Micronova: This Train Is on the Tracks is available now.
Sorry, I am a bit confused by the pictorial slide showing your definition of the angle of deviation. I may be wrong. But the reference point for deviation is your ship's heading, isn't it?
Hi Sir, so do we swing the ship to magnetic north and then take the bearing of the transit object on the magnetic and gyro? And then repeat well for the 8 primary compass point or on what the Master decide
Thank you so much for the vedio sir ! I have a doubt which although is not directly related to the above vedio, but to the concept of magnetism . It goes as-‘ what is a magnetic anamoly and how does it effect our standard magnetic compass ? ‘
Thanks Abhishek, I have more than 600 videos on my channel and most of them are suitable for second mates. Let me know if you want me to cover a specific topic 😊
Thanks for sharing. 9:17 "sum total of all deviations to be < 1 degree". And you said 9:45 "the sum total of all deviations on different headings should be less than one degree". So I presume there must be a list of a limited number of headings that are used for this sum. If so, what are these headings? Are they all the angles listed on the deviation card 10:41, i.e. every 22.5 degrees? But in this case, the sum is obviously far greater than 1 degree.
No, gyro compass points to true north. Magnetic compass points to compass north (but the ship’s iron and cargo content affects its magnetic properties). If gyro fails, steer by magnetic north but correct for effects of deviation and variation.
very informative. the question is about true north. if magnetic north is changing by time to time then true north should also be change because it takes reference from magnetic north . please clear my doubt
Very good video. I am an armchair navigator and this was nice. Did you know in WW2 on Guadalcanal us forces had to use native guides because their compasses were useless because of all the iron there?
Because of the coming micronova, declination is moving much farther, and much faster and so declination information is likely incorrect My up-to-date declination is 30 degrees, 15 degrees off from the official declination for my area. but there is still a way to recalibrate magnetic declination using the shadow of sticks recording the path of the sun---rotation of the earth has not yet changed. First stick will show East. Mark it with a sharp stick pushed in. After a few minutes you can mark sun shadow travel where the shadow has moved - Push another stick in to mark West. Lay a straight stick from the E mark to the W mark. Geographic north or True North is 90 degrees from the E-W line. With your compass pointing toward True North, note how far off your compass is now. That is your true up-to-date declination. More on micronova in my 2nd book, Surviving the Micronova: This Train Is on the Tracks is available now.
Thankyou very much sir ds videos help me a lot lot
Hi sir
Why is the ship swung & compass compensated instead of being swung & deviation noted on each heading?
Thank you sir, this video was helpful
Sorry, I am a bit confused by the pictorial slide showing your definition of the angle of deviation. I may be wrong. But the reference point for deviation is your ship's heading, isn't it?
How do we obtain gyro and magnetic bearing while turning vsl, gyro bearing can be taken using gyro repeater. What about magnetic ???
Nice explanation.. thank you !
Hi Sir, so do we swing the ship to magnetic north and then take the bearing of the transit object on the magnetic and gyro? And then repeat well for the 8 primary compass point or on what the Master decide
correct, the interval (8 or 12 or 16 compass points or every 10 degrees ) is decided by the Master.
Thank you so much for the vedio sir !
I have a doubt which although is not directly related to the above vedio, but to the concept of magnetism .
It goes as-‘ what is a magnetic anamoly and how does it effect our standard magnetic compass ? ‘
u open the compass error record book more than half is "unable to obtain compass error due to overcast skies" even on clear sky days.
Appreciate for the explanation .... Sir please make more video for 2 nd mate examination
Thanks Abhishek, I have more than 600 videos on my channel and most of them are suitable for second mates. Let me know if you want me to cover a specific topic 😊
Deviation due to hard Iron is 10E, when heading 09(c). What will be the deviation on a course 030(c)? I want this question answer
11 W
MO 21 is AMSA's requirement. Is there any international/globally applicable requirement for deviation card?
Marine Orders is a reflection of Solas, MARPOL, etc. you will find similar requirements in Solas ch v.
@@SteeringMariners Thank you for the swift reply!
Thanks for sharing. 9:17 "sum total of all deviations to be < 1 degree". And you said 9:45 "the sum total of all deviations on different headings should be less than one degree". So I presume there must be a list of a limited number of headings that are used for this sum. If so, what are these headings? Are they all the angles listed on the deviation card 10:41, i.e. every 22.5 degrees? But in this case, the sum is obviously far greater than 1 degree.
So Gyro compass is pointing to Compass north? So if we lose compass north we are using magnetic north?
No, gyro compass points to true north. Magnetic compass points to compass north (but the ship’s iron and cargo content affects its magnetic properties). If gyro fails, steer by magnetic north but correct for effects of deviation and variation.
@@SteeringMariners cheers
How does a compass needle align itself?
very informative. the question is about true north. if magnetic north is changing by time to time then true north should also be change because it takes reference from magnetic north . please clear my doubt
THANK U VERY MUCH SIR.............
Excellent explanation sir. But your audio seems to fall away
You are right, I am sorry, these were some of my earlier videos. I will try to re-record them:)
❤
How Earthmagnetism effects the deviation?
MTNM 2B4 panuorin nyu nato. 😁
I think you add 3deg and 36mins to 6deg and 40mins because every year is increasing 8mins so you must add and not minus. No matter it is east or west.