Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 10-03-2014, 06:37   #16
Registered User

Join Date: Apr 2007
Posts: 718
Re: Dumb DSC Question - Distress without MMSI

Well, I just tested an Icom M502 (circa 2000) and it will not transmit a distress call without an ID number programmed and I just happen to have an Icom M127 with DSC board (circa 1997) (first Icom with DSC I believe) and it also must have ID to transmit. A number must be programmed as the ID is a required field in the data stream. I think it's unlikely but there may very well be some radio's out there that have a default ID already programmed into them. I do remember an AIS problem where a certain manufacturer (Nauticast?) had a default ID in an early class A transponder. Iv'e just purused multiple operating manuals from various models and they all indicate that an ID must be programmed for transmitting DSC and that if you press the red button without an ID programmed, it will display NO MMSI and sound an error beep. For those who want to claim that a VHF DSC radio will transmit a distress message without a programmed ID, how do you know that? The only way to know for sure is to test it. Iv'e tested Icoms, Standards and Furuno's and they will not work without ID.

Here's a Coast Guard pamphlet that clearly states:

The DSC radio “distress alert” transmit features
will not work without the MMSI number properly
programmed into the radio


fairbank56 is offline   Reply With Quote
Old 10-03-2014, 07:01   #17
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,923
Re: Dumb DSC Question - Distress without MMSI

Originally Posted by CaptTom View Post

Ironically, I had another MMSI issue come up shortly after I wrote this. I went to program my new MMSI number into the radio I'd originally installed in my last boat. I did all the steps right, but halfway through, the CG did a broadcast on channel 16. The display changed and the half-updated MMSI number was stored. That was my last chance. I have an e-mail in to the vendor to see if they'll take pity on me, or will charge me $60 to reset it.

Moral of the story: put the radio on some odd-ball channel, or disconnect the antenna, before changing your MMSI!
Wow... That's a handy tidbit of information right there!!!

In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote

distress, dsc

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:08.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.