Just plug it in and your in business, then you will see a battery symbol appear on the screen and arrows will move along it from the negative to the positive parts of the battery image. After a few seconds the image will go very dim but it is still charging.
If you don't have a cable just use a external HDD one or a camera cable.
Yes. I have a couple of USB cables from other devices. Does that mean that I can load drivers etc from the Internet without having to purchase teh Navman connectivity kit?