DAT is INSAT based battery operated transmitter which is developed for "NAVIKA' community. In case of emergency DAT transmit an emergency message which consist of [Boat ID, Boat location, Type of distress and time information] DAT transmits to INSAT-3A satellite in UHF band (402 MHz), Then Satellite relays the signal in C-band (4500 MHz), which is received by Indian coast guard Chennai for rescue operation.