This set of equipment is actually the same set of stuff I have on my motorcycle, but it consists of the following:
It's all connected together with a four-wire connection I created for quick interchange between the GPS, radio, and power. It connects one power lead to both GPS and radio, and interconnects the data ports from the GPS to the radio. This enables full communication between the devices, as well as providing vehicle-power rather than depending on each device's internal battery.