A UCL-led group of world-leading scientists is joining Pacific sailors on a voyage like no other – to understand how indigenous navigators expertly find their way by sensing the swells of the ocean. Sailors from the Marshall Islands in the central Pacific are famed for their extraordinary skill of wave piloting. Using feel and sight, they read the water and wind, noticing subtle changes in ocean swells to sense islands 50km beyond the horizon and find their way. The Marshall Islands, which lie