As soon as they come to a shack on the Bayville shore, they enter its garage. And, once in, Ultra Power says to Tin Man, "Now, engage the Eighth Ray sequence!"
"Aye-aye, Skipper!" says Tin Man. That very instant, the back of the shack's garage swings down, at the same time activating an outdoor cloaking device. At this point, Tin Man slides open a secret panel on the Jeep's dashboard, and presses a button marked "Ground Flier," causing the wheels to turn down. Then, a touch screen appears, marked, "Directional Compass," and enters, "Starting point: Two Moons Shack Depot, Bayville, New York; destination point: Inter Mundos Academy, Bayville, New York. Cloaking device: on."
The moment he does this, the vehicle turns invisible, flies to a remote, cloaked island, lands on a landing pad, and uncloaks.