Great Circle sailing calculation with determination of intermediate points

Рет қаралды 35,170

Күн бұрын

Using an example where the vessel departs from the south latitude and arrives in the north latitude, this video shows how to calculate the
1) Great circle distance between the two given positions;
2) Initial course angle;
3) Final course angle;
4) Position of the vertex'
5) Longitude when the latitude of the intermediate point is given; and
6) Latitude when the longitude of the intermediate point is given.
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Contents of this video will benefit mariners preparing for exams (written and oral examinations).
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Пікірлер: 35

@raunakpandey3377 5 жыл бұрын

This is a very nice video. Thank you for the upload. This did clarify my concepts here. Cheers

@suchitersharma9807 2 жыл бұрын

Really great to watch your videos. I was confused in the class with shortcuts and hurry but your videos with a very short timr explained a lot . Thank you very much for such videos.

@captmksrivastava5002 3 жыл бұрын

perfect, to understand multiple questions in one video. even it is lengthy .

@210359 Жыл бұрын

Obviously youknow this subject well,,, thanks ,,very informative

@jayanarayanan7884 Жыл бұрын

Useful one.. Thank You..!!

@VijayYadav-us9yv 4 жыл бұрын

Thank u so much for yr effort

@brightawe9002 2 жыл бұрын

Thank you sir ❤️

@kprathamesh3564 3 жыл бұрын

Thank you sir

@androisturis1384 4 жыл бұрын

Your work is tremendously great Sir, how ever i just want to know how to transfer the great circle passage plan to charts even in large scale so i could clear confusion in my mind on how to plot the great circle after solving the formula of distance,initial course,final course lat of vertex, long of vertex and the alteration in every degrees when you plot on the charts. hoping in your next video tutorial Sir, Many thanks,

@AdityaSingh-pl3rc 4 жыл бұрын

All your videos are very helpful thank you very much sir . I just got stucked in one grt circle sailing question in which initial position , course and distance were given and arrival position and final course were asked . All though somehow i solved the problem using napier’s rule but Im not sure with this can you please explain in your video about such question 😊

@deepanshuchahar8927 3 жыл бұрын

Hi..thanks for the video....I have a doubt about the position of the vertex if both the latitudes are equal for eg: 35N to 35S

@antonyjoseph2936 2 жыл бұрын

Than Q sir

@manojralia1309 2 жыл бұрын

Why do we have to calculate vertex can't we just above the spherical triangle for intermediate points?

@nobelhasan4112 Жыл бұрын

Sir may you make a video on Altitude computation calculation.. Book Capt.Shubramaniam Chapter 20. It will be much helpful for Mariners

@Unknown-fh3ty 3 жыл бұрын

Perfect explanation but I think the position of A & B respectively in the diagram should be interchanged as it does not justifies the position according to the question. This leads to the wrong calculation of the (e) &(f) part of the question which is to find intermediate points.

@farazarain3043 2 жыл бұрын

Sir please explain great circel sailing with clear concepts ,we did it by your method but we found mostly answer wrong in subramino book thanks

@Riderla 2 жыл бұрын

Sir, If dlong is 90 or more than 90 then vertex should be between A&B in samehemisphere , is it correct ?

@shaneburas1124 4 жыл бұрын

Great video, please make one using miles as in example finding the latitude of 600 miles west of the vertex. For example.

@shaneburas1124 4 жыл бұрын

Thanks for helping, im still having trouble figuring how to answer this problem,gc dist. from lat 25*50N long 77*W to lat 35*56N long 06*15W. Vertex position is lat 37*35.6N long 25*57.8W. Find the lat intersecting the gc track 600miles west of vertex along the gc track. Could u please show me where im goin wrong. Thanks so much

@shaneburas1124 4 жыл бұрын

Im reworking problem and i think ive figured out where im goin wrong, ur videos have been a tremendous help, cant thank u enough

@saizk7314 2 жыл бұрын

Sir for the question your initial course came NE but sir i have a doubt regarding it as our long is going from 151E to122 W ie moving towards west so why we take NE??? THANKS IN ADVANCE SIR

@rohitcharles007 11 ай бұрын

Can you conduct online class

@yashrajsingh9684 3 жыл бұрын

Sir aapki aawaz clear nii aati pls agr thoda tej bola karie.thank u

@anirudhnair1540 5 жыл бұрын

If initial and final position are on same latitude but opposite hemispheres, where would be the vertex Initial course is less than 90 and final co. Is more than 90 Thanks in advance

@SteeringMariners 5 жыл бұрын

Hi Anirudh, the calculation and the process will remain the same as long as large distances (greater than 600 nautical miles) are being covered. I can explain better with answers if you can give me the specific positions (include the latitude and longitude of the two positions). I will revert with answers.

@anirudhnair1540 5 жыл бұрын

A- 30 N, 065 20 W B - 30 S, 079 56 E FROM A TO B

@ferozwaris746 2 жыл бұрын

pls increase your volume it's to low without headphone we can't hear u

@rhodafevantales9397 3 жыл бұрын

what If They Are Both south

@brightawe9002 2 жыл бұрын

Hi in Jesus name

@websterjhonzmifa6114 4 жыл бұрын

Sir. I confused , I realised that your PA and PB was change. Because your PA is 53*13' and PB 123*51'...Try to look cos PA it should be 123*51' and cos PB it should be 53*13'. It doesn't matter if PA And PA was change?

@SteeringMariners 4 жыл бұрын

Is it when I am calculating the distance (AB)? You are correct, I should have written the PA value first and then PB but it doesn't matter because I still multiplied the same numbers (I just wrote them in the wrong order).

@websterjhonzmifa6114 4 жыл бұрын

Yes sir in AB distance.. .i got itSir. Thank you so much.

@SteeringMariners 4 жыл бұрын

@@websterjhonzmifa6114 No worries, all the best:)