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Sailor Services

The Maritime Mobile Service Network (MMSN) is dedicated to serving the amateur radio operator at sea, on either a personal vessel or commercial vessel.

Our net control stations have all of the common emergency numbers at their fingertips and are very capable emergency traffic handlers.  We have a small staff of on-call doctors who can assist you with a medical problem ranging from a hang-nail to a serious problem.  We also have vets on-call who are willing to assist you if your onboard pet becomes ill.

Please read the sections below to learn more.


The MMSN offers our ShipTrak Position Display System.  This system was written with your family and friends in mind.  It is intended as a means for them to follow your progress across the water.  This is a free service!

ShipTrak will display all of your position reports that have been entered into either the Yotreps database or the Winlink 2000 database.  When a callsign is entered, both databases are searched, the position reports for that callsign are gathered, sorted by date and time and then displayed on a map with dots representing the positions.  ShipTrak also displays the position reports in text form, below the map, and the map can be printed as a permanent record.

If you do not have Winlink 2000 or Yotreps onboard your vessel, the net control stations of the MMSN will be pleased take it from you over the air and enter the information into the database for you.  They will also ask you for some weather information for the National Weather Service (see the next section below)

Weather Information

The MMSN can assist you with the current high seas forecast and marine weather information from either the National Weather Service or, if you are a way out there, the weather service whose area you are in.  Our network covers all of the Atlantic Ocean, the Caribbean, Gulf of Mexico and the Eastern Pacific.  Under ideal radio conditions, we can also cover parts of the Mediterranean Sea, the Indian Ocean and the central Pacific.

Our controllers will also keep you advised of tropical storm developments and hurricane information issued by the National Hurricane Center.  The bulletins are read hourly on the net frequency during times of active storms.

Miscellaneous Services

Of course, as it has always been, we offer phone patches to any maritime mobile station where third-party traffic is permitted.  Several of our net control stations have toll-free service to the US, Canada and Puerto Rico.  Those without the toll-free service would make the call collect.

In keeping with the times, we also offer to send an email to someone if you do not have shipboard email.  We can also get you the ball scores, hockey results and just about any other information you may want.

As mentioned above, we also have some active and retired medical practitioners who have volunteered to assist with onboard medical problems.  They are all hams and can either be patched to the vessel from their home or office or they can get on the air and talk directly with the vessel.  Should you need some medical advise, please check in and ask to speak with a doctor.

Feel free to check into the net anytime, if even just to say hello.  Again, the MMSN is here to serve the ham-at-sea.