An underwater positioning system for scuba divers includes a base station having an underwater transmitter and receiver for sending and receiving underwater signals. The system also includes at least one diver unit having a scuba-style mask with a plurality of receivers for detecting the transmitted base signal. A diver display is positioned within the inside facing portion of the mask for indicating the direction of the base station. The diver unit also includes a transmitter for sending an emergency SOS signal to the base station and other diver units.