of the devices is worn and operated by each diving partner and each device through an arrangement of ultrasound transmitters and receiver pairs affixed thereto monitors relative distance between itself and each other device in use by a diving partner the device has a user interface including a plurality of push buttons and liquid crystal display to set and indicate relative distance relative direction low battery fault and chime or vibration warning mode the warning mode alerts a diver when a distance limit between companion divers has been exceeded application_number US 19715098 A description an underwater location and communication device in accordance with the present invention is indicated in fig1 by the reference numeral 10 as will be noted in fig1 the device 10 has a box like external appearance and is broadly comprised of a durable water proof outer case or housing 11 that is made of high strength plastic or any other sound material a group of push button switches 12 13 15 and 17 that is located on a front panel of the device 10 and are used by a diver to operate the device 10 a liquid crystal display 14 that is also situated on a front panel of the device 10 and that provides informational data to the diver a belt clip 20 that is fastened to a rear panel of the device 10 and serves as a means by which the device 10 is worn by the diver and a plurality of ultrasonic transmitter receiver pairs 22 as is more clearly shown by reference to fig1 and 2 a transmitter receiver pair 22 is provided on all panels.