NP 283 - ALRS Volume 3 (Explained: Contents and How to use)

Hope at Sea (Prasobh Sugadhan)
1 follower
Apr 23, 2026
This is a video detailing the procedure to select an ALRS Vol 6 for Passage plan, check its corrections, and the detailed explanation of all the contents of the book.
After watching this video, I have a firm belief that you would find it easier to use this book for bridge work, and passage planning.
I hope this video will be useful for your future career paths. ❤️
Good afternoon, so today we will learn about ALRS Volume 3, also called NP-283.
So this is the book.
Before that, I'll show you how to find the book.
This is your Admiralty Chart Catalog, NP-131.
So in this, under Publications, that is a list of ALRS.
In ALRS, we are going to select NP-283.
So you'll just have to draw.
This is the NP-283 diagram.
Draw the place you're going to go to and select the NP, which volume you are.
So there are basically two volumes.
So we'll be, my ship is in the Far East, so we'll be using Volume 2.
Next, before this ALRS Volume 3 is opened, I'll show you something else.
This is the Quarterly Notice to Mariners, NP-39 of 21.
In this, they will give you the whole list of corrections.
So this is Volume 3.
So Volume 3, mine is 2nd part, week it was published, edition, and the year it was published.
And below it, they will give you all the corrections that were applicable.
See, Australia, 51 of 2020, then of 2021, 5 and 11.
These are the weeks of Notice to Mariners.
So let us go to ALRS Volume 3.
As soon as you open the book, first you have to write down the place and date where you
received your book.
Next comes the Record of Updates.
So this is the record of all the updates that were carried out in this volume.
And then comes the contents.
Remember, Volume 3 helps you in Navteq's EGC, Faximile, and weather reports.
So basically, I'll turn the pages.
These are all same for all the ALRS Volumes.
And these are the abbreviations and glossary that are contained in this book.
You can see.
Then comes List of Services in Country Order.
So these are the country lists and their stations.
So I'll turn it.
Then comes the Maritime Safety Information.
So Maritime Safety Information, they are giving you a reprint of some journals, manuals.
So the types of broadcast, Navteq SafetyNet, then Scheduled, Scheduling of these messages,
and Navigational Warnings for Worldwide Navigational Warning Services.
Then Sub-Areas, this is an important thing.
What are sub-areas, what are coastal areas, what are local areas.
So this, I'll keep it for a moment so that you can read it.
Then comes the Structure of Navigational Warnings, how they are meant, again.
Then the Practices of Countries.
So this book covers some countries, so what are the national practices for Maritime Safety
Information broadcast.
So I'll give you just an example.
You can just pause the video and read around it.
This comes for the whole book that has been covered, all the countries.
Then comes Radio Navigational Warnings on the Internet.
So they'll give you the list of all the nav areas and the internet link.
Also the AIS Broadcasting.
Then the SafetyNet.
SafetyNet is basically International Automatic Direct Printing Satellite Based Service for
Promulgation of Navigation and Meteorological Warnings.
And they will tell you what to do if you miss a message.
This is important.
If you miss a message, just switch off the terminal and start it again.
Then the internal memory gets cleared and the messages, if it is rebroadcasted, you
will receive it and it won't be skipped.
So this is what you will do when you skip an EGC warning.
Then this is basically the satellite footprints of SADC.
Which satellite covers which area, POR, AOR, West AOR, East IOR, again POR.
So this comes in SADC.
Then Fleet Broadband, which satellite is covering which area.
This is for nav area, this is for met area.
Then comes the EGC MSI Broadcast System Operational Information.
So they are giving you which nav area, which coordinator, what is the time of the EGC broadcast
and which is the IMRSAT-C satellite.
And this is Iridium, I have never sailed with Iridium.
After navigational information comes the metrological information.
Again the met area, coordinator, which time they are going to send you the metrological
broadcast, which SADC is going to cover it.
Remember these are all corrections.
So you can see how the correction has been done.
This comes all the met and nav area diagrams.
So suppose your ship is going into a region, you just select the stations.
So if I am going through met area 10, I will select met area 10 on my SADC.
I have already uploaded a video about this, the navtex and the weather facsimile.
So we will cover it, I will skip through it.
Next comes the navtex.
So the navtex will, they will give you a brief description of the navtex, what the navtex
is, then the standard format of navtex messages.
Then comes the types of message and after this, the abbreviation, the list of all the
abbreviations that are used in a normal navtex message.
Then comes the navtex index diagrams.
So it's just basically, you just have to draw a line from where you are going.
So South Africa to South America is covered by x6 and x11.
I've already described it in an earlier video about navtex, please check it out.
So as a station, for example, the station, this is the coverage of this station and station
code is C. Charlie, I'll just skip through the navtex.
After navtex comes the radio facsimile, that is the weather fax.
So they'll give you a brief description of how to use a weather facsimile station.
This has been explained earlier.
Then comes the symbols and abbreviations that are used in the weather fax.
Then comes the list of all the facsimile stations in the world.
So once you find out which area you are going to, just take out the place that you are going
to and select this facsimile station.
Please watch the earlier video for a detailed description.
After the weather fax comes another important thing called radio weather service and navigational
warnings.
So this section is in an alphabetical order of the country's name.
So this section starts from A and ends at Z.
And whenever it is a navtex is a red color, that means it is an international navtex and
it is an MRCC.
If it is blue color, that means it is a national navtex and it is normal radio station.
And blue color means it is a commercial radio station.
Then comes this whole section is used to identify the frequencies, then their channels, type
of propagation, then these are all remote stations and their location.
Then the types of messages, what time these messages are going to be issued and what type
of messages are going to be issued.
The explanation is given out here.
After this comes the country-wise codes.
Before that the weather bulletins and navigational warnings.
Now it is the country-wise code of all the stations.
Example, if it was Australia, the control center is at Perth, Australia, the control
stations.
I will show you an example with a remote station, that will be a better example, let me check.
So I will go to some place with remote stations.
So if it is Canada, Victoria, remember this is an international navtex with an MRCC control
station.
This is the point.
Then these abbreviations are explained here, what A, B, C to H stands for, which channel
they are going to transmit, that means the frequency and these are all remote stations
with their locations.
So this is basically radio weather factional service for navigational warnings.
I believe that you can read these lines.
So these are explanation of what alpha to hotel stands for.
After this comes, these are all corrections, you can see.
Then comes, remember this is in an alphabetical order from alpha to Zulu.
After this comes the multilingual list of terms used in weather and sea bulletins.
So what means, basically all the bulletins are transmitted in English followed by a local
language.
So English is standardized and if it is in English what corresponds to French or to Spanish.
So this is how it looks like.
After this comes a very important point.
This is called ship's weather report and these are all contact details of the port
metrological officers.
Why you need them are, suppose you want to correct your metrological instruments on a
ship or you want to compare your barometer, this is the, suppose you are going to Canada
and you are in Atlantic Maritimes, this is the person you have to call.
So he will provide an efficient, competent person to come on board and compare your barometer
with their standard barometer as well as any service to the metrological instruments.
So this is how you have to contact the guys.
After this comes a list of the port metrological officers.
So they have explained it here only, within the light blue area the number of metrological
observation is inadequate and all vessels in these areas are requested to send a weather
report via IMRSAT code 41.
So suppose you are transiting this place, you are obliged to send a weather report.
So for sending a weather report, IMO has set a certain standard and this is the World Meteorological
Observation Voluntary Observing Ship Program.
So they are giving you an introduction, observation, the types of ships which are classification
of warships, then comes, these are all observations for each class of ship in the war system,
then the reporting procedures.
So this and comes the codes.
These are the codes that are used for sending a weather report.
After this comes ice reports.
Ice reports are, so there are four organizations that provide ice reports.
So the four organizations that give are the International Ice Patrol, the Canadian Ice
Service, this is the International Ice Patrol, how to report it, they are giving it in details.
Next comes, these are all International Ice Patrol, their frequencies.
Then comes the Canada, Canada, this is also an ice patrol organization.
After this comes the Greenland and after Greenland comes the Russia.
It is basically in the northern sea route and in this, in this Russian Ice Patrol they
will give you the contact details of all the ships that are available for icebreakers.
So these are the list of all the icebreakers that are available and this is basically the
northern sea route.
After this comes International Meteorological Scales and Definitions.
These are basically how you fill your logbook.
So if you have any doubt about filling weather on your logbook, you can always refer to this
book.
Then Descriptive Terms used in Marine Forecast by the UK, when it is issued by the UK Meteorological
Office.
Then the Conversion Tables, after this conversion for barometric into millimeters, then into
hectopascals, millimeters to hectopascals and then comes Wind Velocity, knots to miles
to meters to kilometers and then comes Weather Apps.
These are all basically applications that can be downloaded on your phone.
So these are the apps.
Next comes the effects of weather on space, that is basically the solar flares and how
it affects it.
They have given a brief description of what is what.
Then what are geomagnetic storms, radio blackouts, their effects, their average intervals of
occurrence.
After this comes basically the index and finally there will be pages for writing down the notes.
So this is basically how NP283, that is Volume 3 of ALRS is to be used.
I hope you understood how to use it and how to correct it.
Thank you.
