The Raymarine Sea Talk-Ng Backbone Starter Kit is a must-have for any boater who wants to take advantage of the features and capabilities of the Raymarine Sea Talk-Ng marine communication system. This kit includes the Sea Talk-Ng base unit, a power supply, and a USB cable. The Sea Talk-Ng base unit connects to your computer to download maps and other information, and the power supply provides power to the unit. The USB cable allows you to connect the Sea Talk-Ng base unit to your boat's USB port for easy downloading of maps and other information.