A smaller prototype of Harbor Wing, the X-1, has been petering around Hawaii for some time now. The new model is scheduled to set sail this fall. Guided by GPS, the X-2 will venture into the open ocean, going solo on a preprogrammed course from San Diego to Hawaii and back again. That course is pretty precise — Harbor Wing supposedly never veers more than five meters off its designated path. It’s got a collision avoidance system to avoid rogue objects that turn up in the Pacific, self-defense capabilities to fend off attackers, and can survive some pretty nasty weather conditions. 18-foot waves? No problem.