There is an interesting bit of technology here, with implications for Maritime Domain Awareness.
The Wave Glider began its mission on November 27, 2015 in the South Pacific, where it helped the UK FCO protect the Pitcairn Island Marine Sanctuary against illegal fishing activities. After successfully completing its mission, the Wave Glider was remotely piloted more than 2,808 nautical miles (5200 km) — through strong equatorial currents, doldrums, and challenging sea states — back to port in Hawaii. Along the way, it collected 9,516 measurements of meteorological, oceanographic, and marine biodiversity data over expanses rarely traveled. This data was recently used to support the worldwide Fishackathon, a program sponsored by the U.S. Department of State to promote innovative ways to stop illegal and unregulated fishing. Altogether, the Wave Glider was continuously at sea, untouched, for 213 days while traveling a total of 7,205 nautical miles (13,344 km).
There is more about the Pitcairn Island mission here, but its potential is not limited to fisheries. Check out the segment of the video below beginning at 4m24s to 5m20s.
Thanks to Mike for bringing this to my attention.