A novel quantum sensor that measures gravity changes by detecting variations in the travel time of falling atoms has been tested in a first of its kind experiment aboard an Australian naval ship. The sensor—a dual gravimeter—has been developed by Australian company Q-CTRL and could reach the market in late 2026. During the tests onboard the Royal Australian Navy’s aviation training vessel MV Sycamore, the crew was able to navigate for 144 hours without GPS access using the autonomous prototype s...