Pharos Traveler 137: GPS Smart Phone Offers Navigation, No Network Required (PC World)

PC World - Most major carriers now offer GPS navigation services on a pay-per-day basis (as an alternative to purchasing a monthly subscription). But those services typically depend on cellular network connectivity: Drive outside the range of coverage, and you're faced with incomplete service--or none at all. (For more, read our review of the navigation services available on BlackBerry devices from three major carriers.) (link)