If you need directions only occasionally or don't want to carry around a separate GPS device, a cell phone with navigation
capabilities might be a good alternative. Some cell-phone service carriers, such as AT&T, Sprint, and Verizon, are now providing
GPS functions that can be accessed over their data networks through compatible GPS cell phones.
GPS cell phones' menus and features are similar to those of dedicated GPS units, including spoken and onscreen turn-by-turn
directions, traffic info, and a point-of-interest menu. A key advantage of GPS cell phones is being able to get directions
from a device you usually carry with you. And providers continuously update their databases, so you're less likely to get
outdated information.
The service's cost is typically about $10 per month, or the service can be used for about $3 per day. That makes it easy to
subscribe just for the period of a vacation or for one-time events.
On the downside, the small size of some cell-phone screens can make the map and directions hard to see. Smaller speakers compromise
the audio quality of spoken directions, and small buttons on GPS cell phones are harder to use than on larger touch-screens.
Expect to pay up to $50 for a mount, and you'll need a car charger for extended use. The navigation function won't work if
you don't have access to a data network. And over a couple of years, that $10-per-month fee will add up to the cost of a stand-alone
portable GPS unit that's easier to use and does not require a subscription.
Still, some analysts see cell-phone navigation growing. According to the Telematics Research Group, over 6 million phone-based
navigation units are expected to be sold in the U.S. in 2008.
For more information
portable GPS navigation systems, see our buying advice and Ratings.