The revolutionary UDI device combines world-first two-way digital messaging technology, SOS and homing capabilities, a state-of-the-art dive computer and 3D compass - for a complete underwater system that let's you share, connect and stay safe. With UDI, you can: - Share in the underwater excitement with your dive buddies - Transmit and receive directions and instructions - Alert other divers you are lost, in danger or need assistance - Receive reassuring acknowledgement to distress alerts - Communicate underwater like never before