I am using this to keep my Garmin Nuvi 360 powered up while driving. I didn't know this when I got it, but if the Garmin is plugged in and not using battery power, it automatically turns on when the car is turned on (that's what I get for not reading the instruction manual, lol).To have a cleaner appearance in the car, I have the mini-usb plugged into the ball mount that is holding the GPS and not plugged into the GPS itself. Unfortunately, that port is really close to the ball mount which restricts it's movement when plugged in. With the adapter, it makes the cable less intrusive and makes the GPS free to adjust with the ball mount to nearly any position desired. In combination with a 1.50 mini-usb cable, probably the cheapest way to keep my Nuvi charged while driving!!