Nuvi 1300 Power alternative
I was playing around, and found a way to power my Nuvi 1300, and allow navigation from a standard USB cable.
When you connect the cable, the unit goes into Mass Storage mode, as though it is connected to a computer.
However, if there is no USB data, the unit will reboot itself into navigation mode.
This works for me, if the USB cable is plugged into a 'dumb' power source.
I used travel ac adapter that came with my samsung digital camera