G'day all, we get many DSC call with no other information other than an MMSI number. Not very helpful! However, this URL http://www.itu.int/cgi-bin/htsh/mars/ship_search.sh#start will allow a lookup of all "internationally" registered numbers if you have online access. It could be helpful in identifying the vessel sending DSC signal. Also it's a good way to check to make sure your number is registered and the limited details are correct. If you don't find yourself in there but did register you most likely registered thru BoatUS or some other entity whose numbers don't get into the international data base. If so I'd sure figure out how to get them into the master list. What good is a DSC if the authorities, who have access to the full details, can't find your number? The FCC issued MMSI numbers are the only ones entered into the ITU database. As always YMMV Dave & Nancy Swan Song Roughwater 58 Puerto La Cruz Venezuela