I just wanted to share my experience on my new Garmin 885. I purchased this unit because I wanted one that was useful in my cars as well as the Valkyrie. This is a great unit but be aware that you can purchase after market power cables that will not do the job.
The Nuvi has a main power input and a USB power input. The USB only provides 5 volts and is used for charging while plugged into a computer or wall charger. The aftermarket cables use this port for their cable that can be wired to your battery. When you plug the Nuvi into this power source (via USB port), the display dims to enable a faster battery charge and the unit is rendered useless for navigation purposes.
If you decide to get one of these excellent units, get an accessory power cable from Garmin and the correct Ram mount from Ram. You will be happy that you did!
