A speedometer and communication device for boats includes a hand-held GPS unit, mounting member and antenna ring. The mounting member has a flange that extends and secures the mounting member to a cavity located in the dashboard of the boat. The mounting member may further have a power plug to supply power and mounting posts to secure the hand-held GPS unit. The antenna ring contains a receiver for receiving GPS signals and a transmitter for re-sending GPS signals. The hand-held GPS unit receives, calculates, and displays data relating to speed, location, time and includes user-selectable buttons for contacting emergency services.