GPS is a great tool for traveling. But if you only travel to unfamiliar places a couple of times a year, then a temporary service plan from the cell phone carrier will work. If you are frequent traveler, a portable GPS then will be very helpful. The features you might be looking for from GPS devices include the size of screen, map database, and how well the direction is spoken. The bigger screen, the better you can see. The more updated map, the better. Some GPS devices will only tell when to turn, but other GPS devices will tell the actual street, exit or highway to turn, which makes driving a lot easier. Extra features like real time traffic report, voice command and bluetooth compatibility are good but not necessary.

Here are some GPS navigation devices for sale on eBay.