In 2017, we developed and launched a unique system of so-called Acoustic Compass for divers. Vostok system consists of a homing beacon Vostok-Base and a diving wrist-mount device Vostok-ACS that determines the direction to the homing beacon and the distance to it. In addition, it is possible to transmit an alert to all divers who have Vostok-ACS acoustic compasses. The maximum range of acoustic communication is 5 km, and the distance to which the distance to the beacon is measured is 2 km.