The definition of “yacht toy” has expanded far beyond Jet Skis and Seabobs. These days, it can include electronic items such as sophisticated drones for recording voyages or portable 4G projectors that can turn any wall into an instant cinema. There are also big expensive toys like personal submersibles, or small, featherweight gear like the latest GoPro camera. In between: a tech golf machine that sits on the rear of the boat, making recommendations for your swing, a backpack jetpack that lets you swim like a barracuda, or a compressor that floats on the surface, making scuba tanks unnecessary. Here are the latest, coolest toys that will launch your vessel into a new realm of fun and adventure.