Topside buoy system

A topside buoy system for monitoring a status of a diver, the topside buoy system comprising:

• one or more transducers for receiving a first sonar signal from a wearable device or scuba tank pod of the diver,
• wherein the first sonar signal comprises dive data,
• wherein the dive data is indicative of a depth of the diver;
• and
• a transceiver configured to transmit to and receive from a water surface topside monitoring station;
• wherein the transceiver receives instructions from the topside monitoring station, and
• wherein the one or more transducers transmit a second sonar signal indicative of the instructions to the wearable device,
• wherein a relative location of the diver to the topside buoy system is determined by:
• receiving the first sonar signal at each transducer of the plurality of transducers at the different arrival times;
• determining a difference between the different arrival times;
• calculating an angle from which the first sonar signal originated based on the different arrival times;
• determining a time delay between an expected receipt time of the first sonar signal and an actual receipt time of the first sonar signal;
• determining the depth of the diver based on the dive data;
• and
• determining a three-dimensional position of the diver relative to the topside buoy system based on the angle, the time delay, and the depth.