Mercury - 1st Mate Safety & Security System SmartCraft Single-Engine Kit 98-8M6007933. Overview. Boating is supposed to feel safe, and this system gives you an extra layer of confidence every time you leave the dock. The Mercury 1st Mate Single-Engine Kit keeps an eye on your crew, alerting the captain and passengers if someone goes overboard. It also locks your engine when you're away, adding a real deterrent against theft. With its intelligent hub, captain's wearable, and passenger RFID tag, t