Collision Avoidance Radar Plotting 1 

I am a DP instructor at Houston Marine and Capt Bob is a very good instructor. I admire his teaching style.

I recommend this one for anyone trying to learn a radar plot. Must watch all the 3 videos . Absolutely amazing Thanks :)

Very clear and practical. I’m just a recreational sailor but this is just amazing stuff to learn and familiarize with. Thank you captain!

Thank You professor for this wonderful lesson and for great gift of sharing with people all over the world. Wish you all the best!

Captain Bob Glover is an OG, I learnt a lot from this video. Thank you!!

A very beautiful , knowledgable , capable and enlightening human being. God be with this man.

I got my renewal tomorrow this has been helpful. thanks

brilliant!! well spoken well explained. Thank you for your time Sir!

this really helped my studying. Thanks very much Capt Bob

Thank you for this video it is finally beginning to be clear to me how to properly plot and calculate the CPA's

Exellent teaching. I got everything right again by seeing the video. Awesome

I'm from Philippines and it helps me a lot, Thanks 👍

thank you very much for this video i think i have watched it about 5 times now. pays to brush up on this stuff :)

Respect to you from Australia 🇦🇺 Seafarers.

Dear channel admins, I really appreciate if you can setup a play list of these very informative videos so that anyone can watch the series form start to end with an orderly manner. Really appreciate the work. :)

I'll do next month, here in Rio de Janeiro (BR), a Captain license exams.and it iwas a great help.... very clear explanation :) Many thanks !!!!!!

Many thanks, I quite got back on track

I wish I had a teacher as good as him at school!

Thank you very much Sir for this video discussion it makes me clearly understand the topic. God bless !

i wish it would be explained to me just like that. my lecture sucks! huge thanks to this man..

Brilliant didactic! Thanks Captain Bob

this is very helpful my dream is to study at north east maritime institute to learn more about this navigation and all part of seamanship work thank you for introducing this video.

May God bless you for this upload sir.

very clear explanation.. thanks

love u sir what a dedication and wat u render was ausm hats off

This helped me. Thank you sir!

This is very good for us sir.specially for students and for refreshing seafarers out there who forgot this one.thanks sir.godbless you😊

excelente forma de enseñar, a pesar de no ser mi idioma entendi perfectamente, me quedaron claro y mejor los conceptos y a pesar de (la opinión de Marina Matic, no la comparto. Tambien aprendi con WA, WO pero nunca nos dijeron el porque, ahora lo recibo claro...) Los 3 videos son para la biblioteca personal, gracias por la enseñanza, un capo.

You sir explain more clearly than my 2/M Instructor

Very helpful information and in depth explanation. Thanks for upload

Excelent work,I need to learn more,nice one

in Russia we don't do so much of work, instead of r - letter you can take 0* because it stands for the zero - observance time. Then you put the point that you name 6' cuz it stand for the Six minutes since the observation yet a good explanation it's always awesome to see how it's done abroad, bravo!

Well executed very good tutorial.

Thanks Sir, Great Job!

yes this is good and understandable. it refreshed my mind. thank you sir :)

thanks for the video it was realpy helpfull.. appreciate ur good work😊😊

This lecture really help me a lot considering the fact the my professor in radar don't even teach us what was the purpose of the plotted lines and their roles.

its very helpful . easy to understand .

Well taught.

This video is so much better than my 2/m instructor

Hi...firstly, thank you for sharing all this amazing content. Where can I find/get that sheet Capt. Bob mentioned in the beggining of the video? Greetings from Spain!

what is the most appropriate to use, radar transfer plotting sheet or maneuvering board? asap

well explained very useful lesson, thank you very much 👋

Merci, clair et bien expliqué

For a person like me after seeing this think I know something which I can suggest or understand what is being done by navigators inside the wheel houses of Vessels

Amazing Cap thks...

Had come across the video several times but backed off cause the terminology of using r, m and RML etc is not used back here in UK. But once i got past and learnt the terminology its so easy, actually now I prefer using RML,r,m and the other ones described later on in the other videos......makes it way more easier :)

what will happen if ARML do not pass between point "e & r" , we have an scenario that it passes at the bottom, and the distance of vector "er" is too short, that it can't intersect to ARML , and i can't figure out what will be my new course?

THANK YOU❤️

How can you use only to targets to determine whether Roc exist or how can you use 2 targets to complete your triangle??

Thank you sir, BSMT student here❤

Being from non-marine background, I can see the underlying theory in this Radar plot. Let, with respect to some origin, my ship is at location p vector, moving at velocity u vector (includes both magnitude and direction). Let the target is at r vector and velocity v vector. Of course I will see my ship as static, and the target will appear moving at velocity v-u vector. For example, if v=u, then apparent velocity v-u=0, I.e., if target is moving in same direction and at same speed as my ship, then the target will appear stationary to me. If v=-u, then apparent velocity= v-u =2v, I.e. if target is moving at opposite direction, but same speed as my ship, then it will appear to be moving at double the speed. Similarly, For any other direction of my ship's course and the target's course, vector difference of v and u will give the apparent velocity. The two points in the radar map at 6 minute interval, give us the target's apparent course(the line joining those points) and apparent speed (distance bet the 2 points, divided by 6minute). Thus I know, the apparent velocity vector v-u. I also know my own speed and my own course, so I know my own velocity u vector. So the true velocity v of target is obtained as: u + (v-u), which is exactly what this instructor does in part2 of this lecture.

Very good video, however I was always taught to always take 3 plots not 2, to establish that his motion is linear? if only using 2 it's hard to see if he is turning etc. we were always told minimum of 3 plots?

Thank you captain from my school PMMS manila Philippines.

Very thanks sir.

thankyou sir :) its very helpful :)

awsum explained by captain saab

Very good indeed: clear, didactic, makes you want to know more ...

Great!!! from FNB barcelona

Well explained Sir😊

Thank you sir..im from Indonesia

Thank you sir

Eloquently explained ...... but I still can't fathom the bearing to the nearest ale house!

God bless you sir

i have a question sir about the 1st plot position (r). Did you put that on your own idea or did you calculate it? (what i mean is the range and the bearing of the 1st plot pos) just thinking it right now.. thanks for the the vids anyway.. its a big help for me ^_^

To me something is wrong. When I do this exercise having set the initial location of both vessels. To take the next position since I am in a moving vessel I reposition my vessel along its path and then position the target vessel as per reading taken. This gives a different values. Also at sea my understanding is at sea large vessel are required to have a 2 km distance. Otherwise it's considered a near miss and are required to record in their log book. If I am wrong please let me know.

Page 90 The characteristic "W" of the Queen (Cassiopeia) is low down on the northern summer horizon as summer opens, but by early August, she is higher in the sky, surrounded by the band of the Milky Way.

r and m relative motion.... I can see it already how next class my students who find this on YT will say WHY are we using WA and WO (Way of Another Way of Own labels.) This is why I keep telling them I DO NOT CARE how do you label target plots, use Chinese mandarin if you want to, as long as you know what you're plotting, that is all I care for. Every city, every university, every lecturer - his/her own labels. No wonder students get confused. But great video. Love the tools you have to do the lecture, gave me ideas.

Thank you

We are gonna go ahead

so much help

This guy's good

Thanks great video! a quick math to find the CPA time 2.5 NM 6 minutes 8.9 NM X? X = 8.9 *6 / 2.5= 21, 36 minutes

Can someone explain why it became 043 in 2nd bearing?

What I want to solve is, given this same problem, what maneuver would I make to keep CPA exactly 3.0 nm. (Reduction of my speed not allowed) It seems I used to know this but have forgotten. I use maneuvering board. I once did this when crossing the USS Enterprise for a photography mission.

What about the terms BCT and BCR?

Why keep switching between minutes & hours? As long as you're consistent, you can use either. For instance, the relative motion speed calculation around 18 minutes works out to 8.9(kts)*6(minutes)/2.5(nmi) = 21.36 minutes, for a CPA time of 14:27:22

Thank you Sir Bob Glover You sounds like Peter Griffin @ 14:30

Anybody else watching this stuck at home during quarantine?

My dad was a navigator in the Army Air Corps during WW2 and continued in the Air Force Reserve later on during the 50s through the 60s during the Gemini Mission. I tried to learn it but still can't get the slightest grasp of this subject matter. It's just way over my head. Astronomy was easier and so is learning Chinese.

How can RML be there when r was 45 & m was 43 degrees. Your RML Is wrong?

Good evening

How did he get the range and bearing of 1406?

where did .35 come from. I've missed something?

Where do you put the .35? Maritime student in philippines 😅

Ótimo vídeo

That is Rafflesia.

Rply mi plsss🥺

¿Cómo se desplazan las ondas electromagnéticas de un radar?. ¿Es cierto que se desplazan en línea recta y horizontal pero respetando la curvatura terrestre?. O sea. ¿Una línea recta y horizontal que paulatinamente se va curvando hacia abajo?. Claro que ya dejaría de ser una línea recta y horizontal ¿O no?. ¿Verdaderamente un radar funciona correctamente una tierra esférica?. Tengo entendido que un radar tiene un punto ciego. ¿La tierra es plana o esférica?. ¿Cómo se explica el hundimiento del HMS Coventry?. ¿Un radar puede detectar un avión a 420 kilómetros de distancia en una tierra esférica?. Un saludo cordial.

refresh!!

Is this college in uk

0.09 Hours ,or about 6 minutes to move out of the way.

Hello

I don have a radar on my sailing boat

why n up heading up

where did he get that 9 miles

@RaulBowers

CYGNUS 20h Albireo 6960 6826 Sadr Veil Nebula 21h 6992, 6995 Deneb (in Cygnus the Swan) 6960 Veil Nebula 21h 6992, 6995 19h LYRA Vega (in Lyra the Lyre) M57 Ring Nebula From 40 degree N Early June 1 am Late June 12 am Early July 11 pm Late July 10 pm Early August 9 pm *Add 1 hour for DST Alabama, us Malabar, india

this is why i have a 3000 dollar radar system WTF do i need to c this

All good & fine. However, the 'newbie' sailors with all their electronic care nothing about you or 'rules of the road' per say. They go where they want...ALWAYS.