Though the GPS signals are free for anyone, consumers might pay a small amount on their bill each month for this kind of "find nearest" service.

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Indeed, for all the potential of GPS pinpointing, if consumers are turned off by having advertisers track their every move - as they've recently demonstrated online - geographically targeted advertising may not be the most promising way to pump up the wireless market.

CNN: GPS to do wonders for wireless browsing

For the first time on a single GPS device screen, Magellan SmartGPS consumers can simultaneously see maps, navigate, and see reviews, tips and offers from Yelp and Foursquare for nearby restaurants, stores and services, plus navigate to those locations without needing to use an additional device or application.

ENGADGET: Magellan's smartGPS navigator has built-in Yelp reviews, syncs with your phone (video)

For example, some consumers find it hard to be without a GPS after using one.

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