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This website was written by Norm Perron, of Redondo Beach, CA. I have been an avid sailor for over 40 years and own a Catalina 42, Aphrodisiac. I currently use three Standard Horizon DSC radios, HX870, GX2150, GX1265S. The primary goal of this site is to provide a “clearing house” of known Group numbers, mostly to reduce the chance of duplicate numbers in the same area. A feature of this table lists ideas of ways you can create your group number so that is has an association to the organization. I have conducted several Marine VHF DSC Radio seminars at many Southern California yacht clubs and other organizations. If anyone would like to see my handout, feel free to contact me.