Johnson Outdoors. has filed a patent for an underwater navigation system. The system includes a buoy transmitting a signal and a dive computer displaying distance and direction to the buoy for divers. GlobalData’s report on Johnson Outdoors gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Johnson Outdoors, Sleep quality monitoring was a key innovation area identified from patents. Johnson Outdoors's grant share as of January 2024 was 72%. Grant share is based on the ratio of number of grants to total number of patents.

Underwater navigation system with buoy and dive computer

Source: United States Patent and Trademark Office (USPTO). Credit: Johnson Outdoors Inc

The patent application (Publication Number: US20230382499A1) describes an underwater navigation system that includes a buoy anchored underwater or hung from a boat, transmitting a signal, and a dive computer carried by a diver, receiving the signal to display distance and direction to the buoy. The signal is an ultrasonic signal with a unique address for identification, comprising two or more bits with a time delay. The buoy includes a sonar transmitter, antenna element, microcontroller, reference clock, Bluetooth module, power source, LED light, and water contact. The dive computer features a sonar receiver, antenna element, microcontroller, reference clock, Bluetooth module, user interface, display, alarm with haptic feedback, sensors like a magnetic field sensor, pressure sensor, tilt sensor, and water contact.

Furthermore, the system allows the dive computer to determine direction using data from an electric compass, compensate for tilt angle using a tilt sensor, and synchronize reference clocks with the buoy through ultrasonic signals or Bluetooth. The buoy has anchor points at both ends, an LED light indicating different conditions, and periodically transmits signals for comparison by the dive computer. The synchronization process involves sending multiple ultrasonic signals, averaging detected times, and using an owen clock. The dive computer's antennas aid in determining direction based on signal strengths, with the microcontroller storing antenna beam patterns for calculating direction and tilt angle between the buoy and dive computer accurately. This innovative underwater navigation system enhances diver safety and efficiency by providing real-time distance and direction information underwater.

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