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How to deal with Navigational warnings, A Complete guide

Most of the external agencies consider navigational deficiencies as most serious one. Not only because these can lead to accidents but also because these are avoidable. External agencies consider any navigation deficiency as the reflection of ship’s management system.

Even Oil major companies take the navigation related deficiencies very seriously. For example BP considers any deficiency related to navigation as high risk. A single observation on navigation can fail the BP SIRE inspection.

Navigational safety deficiencies were on the top for past three years for Indian MOU. And when so much is at stake, we cannot afford to have navigation related deficiencies.

So what can we do to avoid these deficiencies ? Well the answer is…

By knowing what is required and then doing exactly what you know.

This guide will look into everything about dealing with the navigational warnings. Lets begin….

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Comments (34)

Toader.I February 11, 2023

Well explained. Regarding Australian Costal Warnings. It is enough to select Navarea X and the Navtex receiving area (let's say area H) ? Or I have to fill up also the "Fixed Area"? Up to now I couldn't fund any info about the fixed area.

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Ananyo Muhammad December 12, 2022

First of all, thank you so much sir for writing such a wonderful blog. It was extremely helpful and served the purpose of sharing the practical onboard experiences of handling nav warnings. Just a small question. So, I am using two JRC JAN 9201 ECDIS onboard. As understood from above discussion, we should be using manual updates over user map corrections on ECDIS as it has a large collection of ENC attributes. However, practically speaking, I have the backup ECDIS dedicated for all sorts of route planning, chart corrections ,etc. After planning the route, marking on the user maps, I export these files to my Master ECDIS. That gives a uniformity over both my ECDIS. The OOW is able to see all user map editings, route information exactly the same in both ECDIS. However, I am unable to do the same with Manual Updates. As per your blogs, I have succesfully plotted the warnings using Manual Updates. I am doing it in Backup ECDIS. But to display the same changes in Master ECDIS I'd have to manually plot the same thing again on the Master ECDIS. This is like a double job. On the contrary, whenever I am using the user map function to do the navigational warning correction, I can easily export any updates that I am doing in the Backup ECDIS to my Master ECDIS at one click. Saves a lot of time, gives a uniform display over both ECDIS. But I have a feeling that what I am doing is not correct. Can you please give my your advice and guidance regarding this issue? Thanks!!

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ilya kleymenov October 3, 2019

Which distance from our intended route is required to plot navarea messages on ENC? If it 50 miles away or 150 miles, should i plot this? Is it any requirements for this? Thank you.

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John Gallur July 22, 2019

Good day sir.. thanks to your blogs which are of great help to us mariners. May I ask sir regarding the calculation of distances of sighting and dipping lights.. Many thanks..

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Alexandr Popov December 8, 2018

Thanks a lot Capt. Rajeev! Now it’s more clear! I received a lot of answers to questions thanks for your good blog!

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Prem Murugan November 11, 2018

A great read sir. A nice and concise presentation and to the point. Thanks a lot

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Sergey August 20, 2018

Very useful article! Thank you very much!

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AMIT MISHRA June 18, 2018

What are the equipments required for NAVAREA?

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Bernard C. Argenio May 23, 2018

Good evening Capt. Rajeeb, for 1 week that i was reading your blogs i could say that i have learned a lot. Your explanation is very simple and you make every topic so interesting. Thank you for making it more clearer to make our sea more safer. If ever you have a school here in the Philippines, i would not hesitate to attend your class personally. Sir do you have a blog on Chart Management?

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Jenry October 10, 2017

Sir what is the proper management of navarea warnings? is it really need to plot those warnings which is covered by your voyage charts? or there is a specified distance in which it is considered not necessary to plot those warnings? thanks

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Aleksis October 1, 2017

Thank you for great article! You are doing really good job! Can you please advice regarding which NavTex/NavArea messages to record in GMDSS log book? And if it is necessary to record them in GMDSS log book at all? What is the criteria?

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BogdanS May 21, 2017

Hi everyone,I need some infomation for my school project ; I need NAVTEX messages for a route from Port of Soyo,Angola via Panama's Chanel to San Francisco port crossing Atlantic Ocean thrugh all NAVATEREEA's and I don't know where can I find a NAVTEX archive.Thank you !

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SALEEM November 6, 2016

MY Question regarding nav warning through NAVTEX, Can i pass search and rescue by areoplane areas ? and If possible what are the areas to be avoided in navtex.. for example Gunnery, Firing, Bombing ?

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Rajeev Jassal November 11, 2016

Usually the it will be given in the warning itself. If it has something like "Keep clear" to "Maintain a certain distance" we need to be clear of that. If it is not mentioned, then that warning is for information.

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Aleks November 2, 2016

Capt.Rajeev good day. Can you please explain procedures to give folio number to the BA chart those folio numbers which could not be found in chartco outfit or catalogue? Or we have to give folio number to chart by ourselves relaying on are covering by chart? many thanks in advance.

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Rajeev Jassal November 11, 2016

Folios can either be as per the chart number or area. Admiralty has divided the charts in 101 Folios (as per areas). If we feel some chart does not fall in any of the area, the 101st folio is Miscellaneous and that is where we can put that chart.

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Aleks November 1, 2016

I am newly promoted 2 off.Thanks for all this topics they are very clear and helping me to perform my duties as per good seamanship.willing to see more usefull information about passage planning.thanks in advance.

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Rajeev Jassal November 2, 2016

Glad you found it useful Aleks.. sure i will write more on passage planning topics..

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Capt. Nitin Vaidya August 29, 2016

Very well written. Useful practical guide to OOWs

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Rajeev Jassal September 1, 2016

Thank you Capt Nitin..

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Parag Patil July 16, 2016

Very nicely written and explained!! My advice to all 2nd Mates..go through this Blog thoroughly!!

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Rajeev Jassal July 18, 2016

Glad you liked it Parag...

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Amit May 9, 2016

Thank u very much for sharing your views. Things are pretty clear now. Only thing to see is the Cache clearing process. Makers might have different ways to do it in their equipments.

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Amit Mathur May 8, 2016

very practical!!

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Rajeev Jassal May 8, 2016

Glad you liked this Amit. And yes we are aiming to share the practical experiences as there is theory overload on theweb which seafarers do not find a connect with. Thanks for reading.

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Amit May 8, 2016

Thanks again for the response and for the information. Present company's SMS doesnt say much about Sat-C. Sat-C cache thing is new information for me, I will try it out now. But than again going back to my 1st comment ,when i select navarea 2 in the sat-c i should receive all navwarnings from scratch in next transmission. Cache must be clear before the very 1st transmission of navarea 2 which i would receive....I hope u get my point!!!

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Rajeev Jassal May 9, 2016

Yes. When selecting the Navarea 2 for the first time, you should receive all the warnings in the next schedule transmission of that navarea. My suggestion of getting it from marine suptdt or by emailing navarea coordinator is based on the assumption that you did not receive some of the navarea warnings. Also in the first transmission sometimes you may not receive the in force warning list in which case you have to get it from other sources to know which nav warning is missing. But if you are entering Navarea after few days, you will most likely get all the warnings before you enter. So order of preference for getting nav warnings shoudl be Sat C - Chartco - Company - Navarea coordinator through email - direct from web. If you are not receiving navwarnings through sat-C, after you get the warnings from other sources, it must be investigated why we are not getting these from Sat-C. i will think of writing a blog on the topic of what to do in case we are missing warnings from Sat-C.

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Amit May 9, 2016

Got it very well....yesterday I tried out that cache clearing process to see if that works or not, but actually I didnt received enforced nav warnings,anyways m still observing it.(Thrane & thrane Sat c Terminal) . One last thing I want to address is the navwarnings of Navarea I. We receive navarea I warings in two ways ...one by Sat-C and other is through weekly NTM sec-3. So what do u suggest..how management and filing of Navarea -I warnings must be done.!!!

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Rajeev Jassal May 9, 2016

There are 3 ways I see people handle Section 3 of NTM. 1) File separately. 2) Maintain alongwith sat-C warnings of Navarea 1 without duplication and 3) do not maintain Section 3 at all. UKHO issues NTMs. UKHO is also Navarea coordinator for Navarea 1 so they reprint their Navarea warnings in NTM. But as long as you maintain all your Nav warnings through Sat C, it is OK if you do not file Sec 3 of NTM as these are "reprints" and not the first source of nav warnings. This section can be used for verification of you nav warnings for Navarea 1.

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Amit May 7, 2016

Suppose I am sailing within Navarea I and suddenly the voyage comes for a port in Navarea II, now I neither have internet onboard nor the chartco. Can You tell me how to get all enforced Nav warnings for navarea II before planning passage.

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Rajeev Jassal May 7, 2016

Amit.. First thing you should do is select the Navarea II in Sat C if not selected. Next you can ask the in force nav area warnings from your vessel's superintendent, who can get it from internet and email to your ship's email. Please let me know if you have any other question.

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Amit May 8, 2016

Thanks for the reply and the information. Now ,recently I was going thrgh previous vetting reports and i saw an observation stating that navarea warnings were taken from internet source not from the Sat- C EGC. Although the warnings were printed out from the official website of the navarea co-ordinator as per ADRS and the vessel was trading within the same Navarea all the times. What is your view on this observation?

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Rajeev Jassal May 8, 2016

The observation has a merit. If the vessel was trading in the same Navarea, the Sat C is supposed to receive all the Navarea warnings. If it did not, then there are reasons to believe that either something is wrong with Sat-C or with the procedures. But if it was just one or two nav warnings that were downloaded from internet, the observation was not warranted. Onboard we are supposed to follow our SMS Manual and with this regard we may need to check what company's Navigation Manual say about getting missed Nav warnings. I know few companies where in nav manual it is clearly mentioned that if any nav warning is missing, a request for same should be sent to marine suptdt who will provide same to the ship. If it is not mentioned in the company manual, a clarification can be sought from the company. Whole idea is to get only the missing Nav warning from the internet but it surely cannot replace the primary means which is Sat-C. Another way to get the missing warnings is by sending email to the Navarea coordinator email id provided in ALRS. Let me know if you have any other question and thanks for this fruitful discussion.

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Rajeev Jassal May 8, 2016

Another important point. The sat-C has a kind of cache which do not send a nav warning twice if it was received previously. If this warning is still in the cache but you did not receive it, Sat-C will not send it again. To clear the cache, deselect and after few minutes again select the navarea. Don't deselct during broadcast time. broadcast time for each navarea coordinator can be found in ALRS. After doing this, during next broadcast you will start receive all the warnings from the scratch.

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About Capt Rajeev Jassal

Capt. Rajeev Jassal has sailed for over 24 years mainly on crude oil, product and chemical tankers. He holds MBA in shipping & Logistics degree from London. He has done extensive research on quantitatively measuring Safety culture onboard and safety climate ashore which he believes is the most important element for safer shipping.