Itís your first cruise vacation and youíre ready to board. You check one last time to be sure the smart wristband the cruise line sent you last week is securely fastened. Then you join the rest of the crowd on the dock. As you calculate which boarding line is shortest, a crew member glances at your wristband and directs you to a special entrance. No waiting. Once at your room, a sensor verifies the ID in your device and the door opens automatically, saving you from having to juggle bags to find a key.