I fitted one of these units recently for a friend and can't work out (or remember, sure i've done it before) how to input the MMSI.
I know exactly how i did it recently on my M601, i had to power it on with the MENU key held down and then goto the MMSI check option in the menu - is the DS-100 similar? There is no mention whatsoever in the manual!
If I remember right, go through the menu to the MMSI number part, and it literally asks for the MMSI number (assuming it hasn't gone in before). My local dealer did this for me since if I screwed it up, it'd mean connecting it up to some other gadgetry to re-program.
Well i can't damn well find it. I've looked and looked through the menu, even read the book of words and can't find it. It was (is) brand new and i'm the only person to have touched it. When you go into the MMSI check option it says "No MMSI"... still baffled, i think i'll e-mail Icom.
I belive that the early units could only be programmed by the dealer/manufacturer.
The later units could be set ONCE by the owner.
My DSC100 was bought at the 2002 southampton boat show and had the user program facility so it depends on how old yours is/how long the dealer has had it in stock.
In my manual their was nothing on how to set the MMSI number even though it ciuld be user set.
If you give ICOM a ring they can tell you from details on the set if it has the user programmable MMSI number.
If another preson has programmed the MMSI number from memory the setup menu shows the MMSI number programmed instead of the option to program.