Welcome to the ndblist.info Datamodes Section. On this page you will find links and resources for all the modes covered by the DGPS LIST which covers DGPS DXing, Time Signal Stations monitoring, Weather FAX broadcasts and other similar Navigation modes such as LORAN etc. and our other sister groups, the NAVTEX DX List which specialises in the NAVTEX mode, and the brand new DSC LIST, which is now exclusively devoted to DSC / GMDSS DXing. Please click on the buttons below to visit the appropriate sites and sections, or check below for more information on how to join these groups. Please note that these groups are offshoots of the NDB LIST, and anyone with an interest in Non Directional Beacons, Propagation Beacons or any other types of analog radiobeacon, should visit the NDB List home page at: http://www.ndblist.info for more information about them.

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Below you will find information and links about DGPS Beacons, DSC Stations, LORAN, Time Signal systems and NAVTEX Stations, all of which are becoming an increasingly popular DX target by many NDB and LF enthusiasts. You will also find details about a number of useful programs that can be used for the decoding and monitoring of these modes, plus a database of DGPS Beacons and NAVTEX Stations, and also a number of links which will take you to websites giving lots of additionally useful information as well. Members of the groups, or creators of software are more than welcome to have their own files and links included here as well if they think they will be of interest to our members.


Formerly a mode covered on the DGNAV List, this increasingly popular mode now has its very own specialist group which is totally dedicated to it, with a great new program such as the excellent 'YaDD' decoding these signals has never been easier, and more and more people are discovering the fun of monitoring these signals on the various MF, HF and VHF Bands (2, 4, 6, 8, 12, 16 & 156 MHz etc.) every day. To join the group just click on the link below:

DSC List
To join the group or find out more visit the group's page at: https://groups.io/g/dsc-list


Formerly known as the DGNAV List, this specialist group is now dedicated to the DGPS mode, though of course we don't mind posts about LORAN, Time Signals and Weather Fax subjects as well. You can now find the DSC/GMDSS coverage in its own brand new specialist group, which is totally devoted to this increasingly popular subject. You can find details about the group below. The International DGPS band covers frequencies between 283.5 and 325 kHz, and can be decoded using programs such as 'DSCdecoder, Multipsk and Spectrum Lab (plus a few others). To join the group just click on the link below:

To join the group or find out more visit the group's page at: https://groups.io/g/dgpslist


This new specialist group, which is run by Dirk Claessens, now covers the NAVTEX mode exclusively for those with an interest in this subject. The group members monitor long distance transmissions on both longwave (490.0 & 518.0 kHz) and shortwave (4209.5 & HF NDBP). NAVTEX transmissions consist of navigational and meteorological warnings and forecasts, as well as urgent maritime safety information for ships.

To join the group or find out more visit the Groups.io page at: https://groups.io/g/navtexdx


NOTE# - For those interested in the many other modes that aren't covered by our groups, we would recommend a visit to the 'Utility Monitoring Central' website, where you will find links to a great selection of programs. Our thanks also to Mike Agner, for sending in details of many new programs that we weren't already aware of. If anyone knows of any more not already included here please do let us know about them.

Amalgamated DGPS Amalgamated DGPS: - Created by Black Cat Systems, this program is available in both Windows and Mac versions, and is unique in that it can be set up to decode the entire DGPS Band when used with certain SDR receivers.
CocoaModem cocoaModem: - This program created by W7AY for Mac users, will decode various datamodes including NAVTEX, FAX and CW and may be of interest to many of the Mac users who are presently underserved in this field, this program is not free, but may be of interest to some enthusiasts.
DBR Control DBR Control: - Tom Becker's excellent and unique control software for running DGPS Beacon receivers like the JRC NRB-2J (and its Raytheon M93511 and Autohelm equivalent), Garmin GBR-21 and GBR-23, Lowrance/Eagle, Magnavox/Starlink/Leica/CSI/Furuno/MX-Marine/Hemisphere and probably most other DGPS LF beacon receivers. It can decode and log the 4800bps serial data (RTCM binary in Magnavox-standard 6-of-8 format) they produce.
DSCdecoder DSC DECODER - DECODING SOFTWARE: - This comprehensive decoding software, produced by COAA, the creators of the popular 'Shipplotter' and 'Planeplotter' software, now includes the ability to decode DGPS signals as well as DSC and Navtex. This will run on any suitable Pentium level PC running Win95/98/ME/2K/XP, and with a compatible soundcard, and comes at a very reasonable price for the registered version of just 25 Euros. You can download a 21 day demo version from their site, and this will give you the chance to try out this mode, and see if you like it - just follow this link to the download page.
FLDIGI FLDIGI - DECODING SOFTWARE: - This 'freeware' program will decode a number of modes such as PSK31, Domino, Hell, Olivia, MT63, Throb, WEFAX and a few others, and it also includes an option for decoding NAVTEX/SITOR MODE B as well. There is nothing fancy about this, but it's certainly one of the easiest programs to operate in the NAVTEX mode so may appeal to some users. You can download the latest copy in Windows, Linux or Mac versions from the link above.
GMDSS Decoder GMDSS DECODER FOR MULTIPSK: - An excellent 'free' utility program by Mike Simpson, which reads the GMDSS output from MultiPSK and displays the ship/shore stations received in a spreadsheet type grid. Well recommended if you are using MultiPSK and interested in the DSC mode. (NOTE# this should only be used with Windows 7 as it may cause problems when run with Windows XP.)
Hardware DEcoders HARDWARE DECODERS: - This page at Utility Monitoring Central lists many of the 'hardware' decoders that can be used for decoding the modes covered on this website.
HOKA Code 300 HOKA CODE 300: - The most advanced data analyzer demodulator and decoder for HF and VHF/UHF digital signals, with prices to match.
HOKA Code 3-32p HOKA CODE 3-32p: - The most advanced data analyzer demodulator and decoder for HF and VHF/UHF digital signals, with prices to match (optimised for Perseus - will decode NAVTEX, DGPS and DSC, as well as a great many other modes too.
Intercomm INTERCOM: - Older Hamcom style interface which will decode NAVTEX and RTTY signals.
JNX JNX - JAVA BASED DECODER: - A Java based decoder that will run on Mac, Windows or Linux systems, this no frills Navtex Decoder might be of interest to some users, and comes free of charge.
JVComm32 JVComm32 DECODING SOFTWARE: - Another veteran program, and one which has many ham applications such as SSTV, FAX and RTTY, it now also includes a NAVTEX decoding facility as well. This is shareware program, but you can download a fully working demo copy to try it out.
Krypto 500
KRYPTO 500: - A professional signals decoding and analysis suite. One for 'spooks', 'pros' and Lottery winners I think! :-)
MixW MixW HAM DECODING SOFTWARE: - A popular program with many Radio Amateurs due to the number of modes it can receive (and transmit), this will also decode NAVTEX signals with its 'AMTOR' mode.
MSCAN METEO PRO MSCAN METEO PRO: - A well established decoding program, which will decode NAVTEX, RTTY and Weather FAX signals.
MultiMode MULTIMODE: - This program will decode numerous data modes, including DGPS, but is designed especially for Mac users, and is produced by Black Cat Systems.
MultiPSK MULTIPSK DECODING SOFTWARE: - This excellent 'freeware' program by Patrick, F6CTE, covers many popular Amateur modes, and from version 4.9 onwards will also decode DGPS signals as well (you'll find it in the Professional Modes section).
Navtex Decoder NAVTEX DECODER: - A new 'freeware' program from Mark Longstaff-Tyrrell, this is an ideal starting point for the newcomer to the hobby.
Navtexvw NAVTEXview v2.3:
This is a wonderful little freeware utility program, developed and kindly supplied to us by Tobias Taufer (T2) from Germany, and is designed to show the scheduled NAVTEX broadcasts as they come up. This program allows the user to create a window on their desktop which will show stations which are active in 'real time', and also those that are coming up next.

Please note that in this new version 2.3 it now also includes 'NAVTEXmap', a very useful function which allows the user to see where the upcoming stations are located. We would definitely recommend it to all NAVTEX fans! Our thanks to Tobias for creating, developing and sharing this fantastic program with us. (Just unzip it to a folder and then double click on the 'NAVTEXvw.exe' icon to run it, or create a shortcut to this on your Windows desktop). Size = 723kb in a zipped file - latest update of the station list 24th of June 2019. Please note that due to the amount of time it took to keep the old World NAVTEX Database up to date, and the fact that very few copies were downloaded compared to the NAVTEXview program, it was decided to discontinue the database and just keep this program up to date instead.

NOTE# - Tobias also produces another excellent program called 'EIBIview', which covers LF, MF and HF Broadcast Station Schedules, and can be downloaded from Eike Bierwirth's excellent EIBI Shortwave Broadcast website at: http://www.eibispace.de/.
Navtexvw NAVTEXview RE-PLAYER/FOOBAR2000: - Tobias also came up with a very interesting method of re-playing pre-recorded NAVTEX signals using the Foobar 2000 player, and this creates a handy feature which can be used when the NAVTEX sound is not real-time but comes from a recorded soundfile. This will work in combination with NAVTEXview. The relative playback duration is then displayed in the titlebar (caption) of Foobar2000, making it possible for NAVTEXvw to read it and continuously calculate the true recording time, provided you remember at what time you have started your recording. Tobias says that this method may sound a bit difficult, but it's real simple in use and makes offline nighttime DXing possible at any time. (3.47MB - zipped)
NDBfinder NDBFINDER DECODING SOFTWARE: - This program was produced by Bev at COAA for use in decoding very weak NDB Signals, but now also includes the ability to decode LORAN signals. Not freeware, but a 21 day fully working trial version can be downloaded from this link.
Radio Clock RADIOCLOCK DECODING SOFTWARE: - This program was produced by Bev at COAA for use in setting the clock on your PC using Time Signal Stations, but is also useful for in helping to identify them. Works as freeware unless the extra features are required and can be downloaded from this link.
Radio Raft 3.21 RADIO RAFT - VERSION 3.21 DECODING SOFTWARE: - A DOS based data decoding programme by François Guillet F6FLT, this decodes many different modes such as ACARS, SITOR, ARQ, CW, Packet, PACTOR etc. but more importantly, it also decodes DGPS Beacon signals!
SeaTTY SEATTY: - An excellent NAVTEX & RTTY decoding program by DX Soft, this decoder "time stamps" your catches, and is ideal for monitoring NAVTEX channels over long periods.
SIGMIRA: - Sigmira™ is a Software Defined Radio (SDR) application program that runs on Windows and Linux, and will demodulate various military, utility, and "ham" radio signals, including NAVTEX.
Sorcerer SORCERER: - Will decode a very wide range of modes, including NAVTEX, WeatherFAX and several Time Signal Stations.
Spectrum Lab v2.74 b7 SPECTRUM LAB - VERSION 2.79 DECODING SOFTWARE: - This popular program from DL4YHF can also decode DGPS signals, and best of all it's free of charge. Not quite as user friendly for this mode as some of the other programs, but is well worth taking the trouble to get to know. This is an older version, as the later ones aren't quite as useful for this mode. For other modes and the later versions check out DL4YHF's website.
TrueTTY TrueTTY: - From the same stable as SeaTTY, this programme will decode a number of other data modes as well as NAVTEX, but it doesn't time stamp them.
UNIVERSAL RADIO DISCONTINUED DECODERS: - This page carries a lot of information about many now discontinued decoders, and provides a valuable resource for anyone interested in them. You can also download a .pdf file showing a list of comparisons of the various decoders from the link below:

W-CODE DECODING SOFTWARE W-CODE DECODING SOFTWARE: - Another professional looking SIGINT Decoder, this one doesn't list the modes it works with, but I would be very surprised if NAVTEX wasn't included on it. IF you have used this software we would be interested in hearing how you found it, and if it would be of use to our group members.
Winradio Digital Audio Suite WiNRADiO Advanced Digital Suite: - Users of the WinRadio SDRs might like to check this page out for more details.
Winradio FSK Decoder WiNRADiO FSK Decoder: - Yet another useful program from WinRadio, this one will not only decode NAVTEX and SITOR B, but also many other modes as well.
WWSU 6.4 WWSU 6.4: - Not a decoding program, but an excellent database program showing NDBs, NAVTEX and DGPS stations and beacons. Created by Alex, VE3GOP, this is an excellent piece of software for any DGPS enthusiast to have at their disposal. Also very useful for creating your logs, and can be edited to show any notes you wish to make.
YaDD YaDD (Yet another DSC Decoder): - This excellent new program, also created by Dirk Claessens, now gives DSC enthusiasts a new alternative to existing DSC Decoding software, and with a user friendly interface. ** highly recommended **
YaDD2Map YaDD2Map: - This excellent and very useful program created by Claude Marani can be used along with YaDD to plot your captures onto a map and also to upload them to GM4SLV's DSC Monitoring Site.

Animated word. New.** new program, highly recommended **Animated word. New.
GM4SLV GM4SLV's Multi-Band DSC Monitoring: - John, GM4SLV has produced an online Multi-Band DSC Monitoring Site, where you can see all of the DSC logs received by various listeners and uploaded to the site. If you'd like to add to these you'll need YaDD and a copy of the new and excellent 'YaDD2Map' program which can be downloaded from the DSC List Group's File Section. ** highly recommended **

** IMPORTANT NOTE ** - If you plan to upload your decodes to YaDDNet please read this file first: 'YaDD Accuracy'
YaND YaND (Yet another NAVTEX Decoder): Animated word. New.** NEW VERSION 7.0 - 26th October 2018 ** Animated word. New.
- This superb program, without doubt the most comprehensive one currently available, was created by Dirk Claessens, a very experienced NAVTEX enthusiast from Belgium, and offers a large number of unique features. This is a most welcome addition for fans of this mode, and what a great name!:-) ** highly recommended **
YaND Manual YaND Manual v5.3.1: - This is an English language manual for the YaND program above (613kb).
Zorns Lemma ZORNS LEMMA: - This program will also decode NAVTEX signals, but please note that the site is in the German language only.



If you are thinking about giving this mode a try then this file will give you some useful information to help you get started. (updated and revised January 2019, 26 pages 1.82MB)

This guide gives a little more information about the mode of NAVTEX, the equipment used to receive it, and some information about how to understand the various messages that you will receive. (updated and revised January 2018 - 423.0kb)
Interfacing your radio and PC CONNECTING YOUR RADIO TO YOUR COMPUTER: Animated word. New.** NEW 2020 VERSION ** Animated word. New.

If you are wondering how to connect your receiver to your PC this new "interfacing" guide will help you to get started. Please note that this is a brand new version for 2020, and now covers Windows 10. Since a lot of people still use older versions of Windows I have retained the previous versions which covered 'Vista, Windows 7 and Windows 8', and this can still be downloaded from here:(1.29MB). Anyone still using the Windows XP program for their decoding work, should instead use the original 2010 file, which can still be downloaded from the following link here:(754.0kb)

Brian Keyte has provided a comprehensive list of DGPS beacons which users of DSCdecoder can use to replace the basic one that comes with the program, you can download and replace your existing on with this file (rename your old file something like 'olddgpsstn.txt' first if you don't wish to destroy it, you can always replace again at later date if you should wish). (4.0kb)

Download the dgpsstn instruction file  'HERE':

Martin Francis came up with a useful way of receiving beacons of both bit rates using Skysweeper, find out how in this article. (685.0kb)

Brian Keyte takes a look at DGPS Message Formats in this article. (16.1kb)
DGPS Beacons of the World DGPS BEACONS OF THE WORLD v12.2: - Animated word. New.** UPDATED 26th of February 2020 ** Animated word. New.

This 18 page printable .pdf database currently contains a list of known DGPS beacon information, and it is sorted by frequency. The latest update includes some more of the US closures, there may be more of them, but the USCG don't seem to be updating their info so the closure notices are having to come from other sources at the moment. My thanks to Jari Sillan of Finland for some additional info about the Russian UNIDS, any further corrections or updates are always most welcome. (This edition was last revised on the 26th of February 2020 - 158.0kb)

This document gives a good explanation of the various DGPS Message Types and what they do. (88.5kb)
DGPS QSL ADDRESS LIST DGPS QSL ADDRESS LIST v1.7 (.pdf version): - Animated word. New.** UPDATED 19th of May 2018 ** Animated word. New.

In response to demand for more DGPS QSL information I have now removed the basic section from all the other files and put them into one new dedicated publication. This brand new 3 page document attempts to put together known QSL addresses that have worked in the past, and also to make some suggestions for stations that haven't yet been confirmed. Any additional information or corrections, particularly e-mail address used for 'e-reports', that could help to make this more accurate and useful to DGPS DXers would be greatly appreciated. (created 19th of May 2018 - 63.0kb - a special thanks to Patrick Robic of Austria for all the great updates and for supplying the address of the Bulgarian DGPS Beacon for this edition.)

This new printable 5 page publication gives a comprehensive list of many of the terms and acronyms used on by the NAVTEX service: (29.9kb)

CLE Co-ordinator Brian Keyte, advises on what constitues a 'good' NAVTEX logging. (15.2kb)
NAVTEX QSL ADDRESS LIST NAVTEX QSL ADDRESS LIST v3.8 (.pdf version):- Animated word. New.** UPDATED MARCH 2018 ** Animated word. New.

This 9 page document attempts to put together known QSL addresses that have worked in the past, and also to make some suggestions for stations that haven't yet been confirmed. Any additional information or corrections, particularly e-mail address used for 'e-reports', that could help to make this more accurate and useful to NAVTEX DXers would be greatly appreciated. (this edition created 1st of March 2018 - 106.0kb) Updates and corrections to this edition and contributions from users are always greatly appreciated.

Another useful printable guide to how the various NAVTEX Time Slots work. (28.2kb)

This document explains how to get yourself a very nice award certificate for receiving the US Coast Guard's NAVTEX Transmissions. To see a sample of what the certificate looks like click here: (31.4kb)


  • Australian DGPS Service:
  • Canadian Coastguard DGPS Service:
  • Clifton Laboratories Low Pass Filter: - excellent for NDB/DGPS/NAVTEX reception!
  • Commissioners for Irish Lights:
  • Digital Selective Calling:
  • Digital Selective Calling Article:
  • DSC Identifiers:
  • European Differential Beacons:
  • Frisnit NAVTEX Message Archive:
  • Homebrew DGPS Receiver:
  • IALA DGNSS Page:
  • ICS Electronics GMDSS Page:
  • International LORAN Association:
  • Joze Konda's Time Signal Logs:
  • LF Time Signal Links:
  • LORAN Information:
  • Marius Rensen's NAVTEX beginners guide:
  • Mark Hattam's NAVTEX reception page:
  • MSF Time Signal Outages:
  • NAVTEX Pad - iTunes application from Black Cat:
  • Nautel NAVTEX Transmitters:
  • NAVTEX Receivers:
  • NAVTEX Weather Abbreviations:
  • NAVTEX - What it is and how it works!:
  • Nick's Time Signals Page:
  • NIST Time & Frequency Pages:
  • Northern Lighthouse Board:
  • Orwell AIS:
  • Pervisell (suppliers of radio decoding software):
  • RNA-REU-RWW Online database:
  • Southern Avionics:
  • Spanish DGPS Beacons:
  • Suomen DGPS-ASEMAT (Finnish DGPS Status):
  • The Weather Window:
  • US Coast Guard DGPS Service:
  • US Coast Guard Nav Center:
  • US National Weather Service:
  • US Coast Guard DSC Service:
  • Utility Monitoring Central:  New
  • William Hepburn's NAVTEX Broadcast Page:
  • WSV - German Waterways DGPS:

  • DXtreme Software: - Powerful and easy-to-use logging applications for radio enthusiasts.  New
  • DX Atlas: - World Map, Prefixes and Gray Line maps.  New

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