Why are GPS devices getting so popular? And yes they are top sellers - At least the Garmin navigational system with GPS is, one of the top sellers on Amazon.com this year.

A GPS device is the perfect gadget to a highly mobile business lifestyle where you need to navigate unfamiliar cities and get to your destination on time.Though automobiles come with in-built devices for a high-flying executive who hops from one company car to another is not of much use.

Portable GPS systems can tag along with you whether you’re in the company car, flying off to pick up a rental or just getting around in your hometown.

The $950 Garmin Nüvi 660 is designed to make your driving life easier with a large 4.3-inch touchscreen anchoring the unit. Frequent drivers will appreciate the Bluetooth, speaker and microphone that let the 660 double as a hands-free cellular speaker-phone for making and receiving calls. At 6.2 ounces it’s easy to carry from one place to another.