Mercury - 1st Mate Passenger Wearable Accessories Safety System Gear Wristband & Clip 8M6007946. Overview. When you bring friends or family onboard, you're not just offering them a ride-you're responsible for their safety. That's something every boater feels in their gut. The 1st Mate system makes that responsibility easier to carry, adding a layer of reassurance that travels with you from the dock to open water. These passenger wearable accessories, built for the 1st Mate system, help everyone