The Red Emergency button on your VHF radio requires two elements in order for it to work: Location Data from its internal GPS (if it has one) or Location Data supplied by your Chartplotter. And an MMSI Number. Register for that here.
Never a bad idea to have a reasonable understanding of the laws in the area.
Sales And Installation Of Marine Electronics And Accessories, Like Chartplotters, Gps, Fishfinders, AIS Receivers & Transceivers, Multifunction Displays, Marine Audio, Sonar and bottom machines, Navigation Equipment, Radar, Satellite radio, Satellite TV, Search Lights, FLIR, Autopilots, LED lighting, VHF Radios, NMEA 2000 and NMEA0183 networking and more.
Chartplotters and Fishfinders by Garmin, Furuno, Humminbird, Lowrance, Navionics, Raymarine, Si-Tex, and Simrad.
Audio Brands are Alpine, Bazooka, Clarion, Fusion, Jensen, JBL, Kenwood, Kicker, MBQuart, Poly-Planar, Rockford Fosgate, Sony, and Wet Sounds.
LED Lighting by Aqua Signal, Rigid Industries, Lumishore, Lumitec and more
Communications by Standard Horizon, Icom, Navico, Raymarine, Garmin, Lowrance, Cobra, Digital Antenna, Simrad, Uniden and Globalstar Satellite Phones.
Networking of Maretron, NoLand, Chetco, Wave Wi-Fi and Digital Yacht, and for all major brand electronics with NMEA 2000, NMEA 0184, J1939, and other protocols.
Specialty products by Lenco, KVH, FLIR, Seaview, Todd, Shakespeare, Weld Mount