ROVs are controlled by a remote human operator, where as AUVs which operate independently of direct human input.
Now the Wave Glider’s ability to travel over remote mission areas and collect information from inaccessible waters without manned deployment or recovery missions.
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The machine is has two parts: one part that is submerged and connected to another part that floats on the surface. But together, both parts are continuously converting the kinetic energy harvested from the up and down movements of ocean waves into forward propulsion, though it is admittedly slow-going at 3.5 miles per hour.
Also it has an inbuilt battery which stores solar energy, when sea too calm they are propelled with backup system.
Read more at Liquid Robotics.