It's Tiny!
I was going to ask how this unmanned thing remained legal by keeping a proper lookout, or any lookout --- but it is tiny!
A spec sheet/leaflet can be downloaded here:
http://liquidr.com/technology/wave-glider-specifications/
Four ocean-going robots from James Gosling’s employer Liquid Robotics have succeeded in securing a Guinness world record. The Wave Gliders have broken the record for an unmanned wave-powered vehicle by crossing 3,200 miles (5,150km) of Pacific water, breaking the previous record of 2,500 miles (4,023km). The Gliders achieved …