Underwater navigation for divers has traditionally been limited to compass navigation or landmark orientation. However, a team at Graz University of Technology has developed a groundbreaking system that utilizes GNSS-supported buoys emitting electromagnetic signals to provide precise underwater positioning without disturbing marine life.
Challenges of Wave Propagation in Water
The navigation system combines satellite precision with underwater electromagnetic signal transmission. Buoys in the deployment area determine their position via GNSS, particularly the Galileo High Accuracy Service. These buoys transmit electromagnetic signals to divers equipped with receivers, enabling trilateration for precise position and depth determination.
Calculating the propagation of electromagnetic signals underwater was a major challenge due to factors like water properties (salinity, temperature, depth) influencing signal transmission. While the team achieved signal transmission up to 150 meters horizontally, optimizing deeper penetration remains a focus for future development.
Applications and Impact
The system has diverse applications, benefiting sport and leisure diving tourism by guiding divers to underwater attractions via position buoys and head-up displays integrated into their masks. Additionally, it serves aquatic ecology, underwater archaeology, and waste documentation fields without disrupting marine ecosystems.
Tested on golden rainbow trout, known for sensitivity to external factors, the system showed no adverse effects even after prolonged exposure, ensuring minimal impact on marine life.
