The Cobra GPS connects to your VHF radio so all your DSC emergency calls will include GPS data. Interfaces with all current and past Cobra VHF fixed mount radios and is plug & play with the Cobra MR F57 radios. Interfaces with all competitor's DSC VHF radios through NMEA 0183. High sensitivity for below the dash stick on installation. All interfacing cables included. Provides backup data if your chart plotter or multifunction system malfunctions.