Mercury - Wearable Fob Kit 1st Mate Safety System Marine-Ready 8M6007947. Overview. Every captain knows that moments on the water can shift fast. One minute you're cruising into a sunset that feels like it could last forever, and the next you're scanning the deck to make sure everyone's still exactly where they should be. The 1st Mate Captain Wearable Fob Kit takes a lot of that quiet worry off your shoulders. It's a small piece of gear with a huge impact-adding confidence, clarity, and a sense