Discover a deeper connection with the Descent™ S1 diver communication buoy. When paired with up to eight Descent™ T2 transceivers (sold separately) and the Garmin Dive™ smartphone app, the buoy enables topside crew to monitor and exchange preset messages with divers wearing compatible dive computers. (Some compatible dive computers can receive, but not send, messages. Conditions such as surface, waves, chop, objects and diver position can obstruct the signal and reduce range.) Those on the surface can use the Garmin Dive app to see the diver's tank pressure, depth and distance. Surface users can also send preset messages to divers below to alert them of situations that need attention. For positional awareness, divers can track their distance and direction back to the Descent S1 buoy. Once they've surfaced, divers can also sync and review heatmaps of their underwater activity in the Garmin Dive app to gain a better picture of approximately where they were diving. Plus, with a battery life of up to 15 hours, the Descent S1 diver communication buoy can be deployed for a full day of diving before needing a recharge.