WHY SPEED THROUGH WATER USED FOR COLLISION AVOIDANCE ?
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- Опубликовано: 6 фев 2019
- #SAILORVIKAS #COLLISION #SHIPACCIDENTS #MARINERRADAR
#RADAR #STW #SPEEDTHROUGHWATER #SOG #SPEEDOVERGROUND
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finally someone explained it correctly !
Thanks...do share this channel with your friends !
U r right ..first time i got it right
Very nice video...thank you so much for sharing
Good that u liked it, pls share with ur sailor frnds
First time I’ve ever seen this explained properly
Thanks
Very well explained mate 👍👏👌 cheers
Thankyou ! 😊
Partially correct , if relative vector of the target is chosen the aspect of the vessel will not change irrespective of ground stabilisation or sea stabilisation. This problem occurs only when using the true vector.
Yes
Chief u are the best
In short, its simply about aspect clarity.. however the down side is ships are affected differenty by wind and current, so in water stabilized IF you were using TRUE vectors to asses risk of collision, you might get false answers.
(b) Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observations of detected objects.
(c) Assumptions shall not be made on the basis of scanty information, especially scanty radar information.
Very good 😊
Super sir..u r amazing
Thankyou ❤️
🙏 Nicely explain salute Sir
Thanks
Hii sir can u pls explain how the frequency should same in parallel generator by using governor??
Very well explained
❤️
Any doubts you are free to comment !
Why audio is unavailable?
hear with headphones
Thanku very much sir...
welcome
nice explanation
Thanks
The question is still there. What if you have restricted visibility? Why is it so important to have input speed through the water (using mechanical log, or dopler at big depth which might be unreliable) instead of using SOG (GPS) and just change from true to relative vectors? And in any situation one or both vessels must alter the course to starboard so i can't see any confusion here.
Whether it is RV or clear visibility, interpretation of Arpa details w.r.t cpa determination remains same.
Action to be taken for crossing as well as head-on remains same however interpretation of situation whether it is head-on or crossing will be determined using STW and not SOG.
In clear weather with no current, if you are using true vectors and true trails than for a crossing situation the trails will appear to be at crossing angles and if their is a current in a head on situation and you have true trails than also the trails will be at crossing angles (it will appear as a crossing situation) which is not true as head on situation is determined by a vsls heading and not COG. This is the only importance for using STW.
Every equipment has error whether it is Speed log or GPS or even ARPA but so far as they meet the performance standards they all are accepted for use.
I hope you get my point ☺️
Nice
Thanks
Thank you
welcome
In what situations you will put radar on ground stabilize (COG) ? STW is for collision avoidance and COG for?
COG is for coastal navigation , where you come to know your position , whether you are drifting towards land or not.
Video Books - Sailor Vikas Can you explain stowage of survival craft as per solas on nxt video?
@@alaguvel5850 probably in a week !
@@alaguvel5850 if possible have the tendency to use the word could, please, as he is helping and you are commanding him.... Konjam mariyatha pesunga comment pannunga..
I need some tutorial of practical navigation
Which topic bro
Bro at sea if I use ground stabilised & relative motion for collision avoidance is ok?
You use anything no problem, but as per correct procedure, you have to use sea stabilization, as STW it is not affected by current.
How accurately generated will be the CPA and the TCPA information of the target , when we have fed the STW of the own ship ?
Collision avoidance is always with respect to heading thus as per recommendation for old radars u have error of 7 cables and for new radar error is till 3cable
@@SailorVikas Collision Avoidance is a too generic term, which does not reveal whether radar is being used for finding out of target, or , for knowing how close the target will pass, or, for deciding what is the best action for avoiding collision.
Also, 'the recommendation". , what is the source of this information?
As per performance standards , radars built before 1 July 2008 have 0.7 error and radars built after 1july have less error that is 0.3 miles
Question: does the cpa and tcpa of sog and stw input change?
CPA and tcpa are calculated based of range and bearing after you acquire the target.
@@SailorVikas but for TCPA we need speed. Will it change for SOG/ STW??
@@prashantbhushanmishra1102 no bro only OAT traingle is made based on speed, for TCPA calculation u see the distance of line of approach that is OA
Sir plz explain about radar plotting and especially aspect
For aspect - Imagine you are on Vsl A and target vsl is B, now imagine yourself in vsl B. The ANGLE between vsl B heading and bearing of vsl A from vsl B is called as aspect. Now come back to your vsl A...Now whichever light you see of target vsl B is how you decide whether it's color red or color green.
Sir I didn't understand .plz explain me in detail
Bro one question, in jrc JQX-30A model SART have two option "ON" &"OFF".No "TEST" Option then how I will test as I didn't get anything in manual about test procedure
Than just use the ON switch for testing too.
@@SailorVikas if I do the test with "ON" Button willn't be any problm..?
Nope...it's make is such that manufactures say to switch to ON for testing and activation both
@@SailorVikas thanks a lot
Can u send some tips for radar setting
Yup will tell you in short but it will b worth -
1. Before starting radar make sure u inspect scanner is clear of everything.
2. It has gain - it is basically adjusting receiving antenna sensitivity.
Sea clutter knob- to adjust clutter caused around ship due to wind. Sea clutter should not be completely eliminated as it will eliminate small targets too.
Rain clutter - used to penetrate rain drops and paint a target, it can also b used to eliminate clouds.
3. Best radar setup is true trails and relative vector as u can see past posn of ship by its trails and whether it will approach u or not will b determined by relative vector.
4. Relative motion or true motion depends on individual to individual.
5. When transiting near land / coastal - keep on ground stabilization to determine course over ground
And for collision avoidance use sea stabilization that is STW.
I hope this would help you.
www.psicompany.com/man-prod-info/furuno/Furuno_Marine_Radar.pdf
Nice
bro can you explain about the diff between true and rel trails
Already explained in radar videos
ruclips.net/p/PLHMRo9UqDFq4GXaxFtcpSNNS3PLTx0klJ
@@SailorVikas good job
@@sergiimagalu9682 thanks
I used sog on radar, who cares? Ground stabilized relative trail with range ring on. No need to aquire target, 1 look at radar i know cpa and tcp right away, no need to wait couple of minutes to have accurate figures. Only disadvantage it dont trigger cpa warning alarm.
The Sound is Crashed somehow Sir
Pls repair it i cant hear thanks
Listen with earphones it will work
4 stages of collision
ruclips.net/video/uZH-uYr8OYs/видео.html
Only for this video audio was no clear... I couldn't get it sir
Pls listen with earphones
Voice is not coming?
Use headphones
No sound plz make video with sound vectors😅😅
Headphones bro
@@SailorVikas using headphones are of no use same issue persist
Try other headphones/ earphones bro coz got many views and all can see it
@@SailorVikas ok
Sir what is your rank ?
No sound
Listen with ear phones
Audio plss
Hear with headphones.
Audio issues
Listen with headphones
Fundamentally disagree. Both SOG and STW are fine for collision avoidance. Determining aspect based on RADAR observations is a BAD and DANGEROUS practice. Remember that crossing rules apply only to vessels "in sight of one another" therefore if you want to know you aspect, look out of the window, not your at your RADAR
Hello ....thanks for commenting....determine aspect is based on calculation in radar plotting.... visually seeing u cannot calculate his heading....u have to use available tools to measure degrees of red or green aspect ...I hope u understand !
@@SailorVikas you don't need to "calculate his heading" in order to apply to apply RoR or for collision avoidance. During daytime you will clearly see if you can see his port or stbd side just by visual observation at night it is even easier since you will see his lights, this is all you need to know to apply rules properly. STW has many inherent innaccuarcies that make it unreliable. Use your eyes to determine aspect and apply the rules.
@@Wolfy8668 noted urs and I understand yours ...but exam point of view ...when it is asked to determine aspect....u have to calulate that aspect in degrees.....which u cannot determine by simple seeing the other target visually....u have to have other ships hdg to determine aspect in degrees .....this is taught in radar / arpa course after 2nd mates and it's also their in radar arpa book of Subramanium....I hope you get what I am trying to convey.
@@SailorVikas i understand that examiners are sometimes hard headed but then again they are only human and can be wrong. In this case practice is more important, we already have to many "armchair" navigators out there. The fact of the matter is that on modern systems ground stabilisation is perfectly acceptable for collision avoidance "provided that the OOW understand benefits and limitations of such set up"
@@Wolfy8668 yes whatever you saying is practically correct but when it comes to orals....you have to say what is surveyor expecting from u....that is stw to be used for collision avoidance...and never speed over ground...speed over ground only to be used during arrival departure ports. If you use speed over ground for collision avoidance and if their is easterly current...the vector will appear in radar as crossing in true motion and this creates confusion for the OOW...about whether it is crossing or head on....that's the reason when u use speed thru water in easterly current....u will get proper vectors in radar which eliminates the confusion as head-on situation is considered when hdgs are reciprocal and not the course over ground being reciprocal.
What about if the target vessel has strong sidewind, her True Course is let's say 090 deg, but the bow pointed to 045deg, so what you see on radar wont correspond to what you observe visually. Or the influence of wind isnt important in the case of radar plotting? Pls explain
For collision avoidance both vessels has to be close by and thus wind acting on both vessels will b same, thus our hdg will change too.
@@SailorVikas with respect, so my question isnt dumb as i suppose? i mean we just assume that conditions are the same because we are close, but theoretically situation i described could take place? Radar detects by consecutive bearings only the true course path of the vessel but he cant know the heading(of course if the info from AIS isnt supplied)
@@SailorVikas if our HDG is 090,and our true course due to the wind is 045, we must do calculations on the plotting sheet with the value of 045 right?
@@smith1760 always on heading, cog is never plotted in radar plotting
No sound
Use headphones
Audio issues
Hear in headphones bro
@@SailorVikas ok