Californian, Damon McMillan has built an autonomous solar-powered boat called the Seacharger that completed a crossing from the California coast to Hawaii arriving on 22 July 2016. The ‘home-made’ craft is about 2.5 meters long and has a mass of just over 22.5 kg. It completed the 3900km journey in 41 days, travelling at an average speed of 2.11 knots or 1.09m/s. It is powered by two solar panels with battery storage. Damon can communicate with the boat using two-way satellite modem.
The boat was re-launched from Hawaii a few days later to travel onto New Zealand.
At the Seacharger website you can see the full specifications of the boat, find out how it is navigated and follow the tracking map that is updated every eight hours.