Uses

• Your decision on which GPS unit to buy will greatly depend on what you will use it for. You can find GPS units designed specifically for cars, planes, motorcycles and running.
  
  

Maps

• Different units come with different pre-loaded map options. Some are strictly national while others cover the globe. Consider whether or not the device has free map upgrades. Roads change and map downloads can get expensive. Both Garmin and Magellan have units that come with free map upgrades.
  
  

Cost

• Cost might be a factor in purchasing a GPS device. You can spend as much as $500 on a road unit if you want a feature like Internet access. Most GPS road navigation devices will cost around $150 - $200 depending the maps, functionality and how new the device is.