I have a Montana 600 with driving maps and OS Landranger for "off-Road" and walking. It came with a dedicated car mount, a power pack, a solar charger plus mains charger and various cables. For driving, there are numerous options, and for walking you just keep the arrow on the path and walk. It charges off the car mount and maintains sat. fix even when in your pocket.
Fabulous piece of kit.
Roger