The growth of cell phones with global-positioning technology is making life uncertain for the makers of personal navigational devices that help drivers figure out where they are and where to go.

Last time I checked out Bryce Canyon National Park, I dutifully lugged along my colorful, “ruggedized” electronics—a Garmin handheld GPS and a bulky Casio watch with a digital compass. But during the ...

Global Positioning System (GPS) capability is one of the most popular new features for current and next-generation cell phones. Using the GPS feature and associated firmware, it is possible to ...