The data a map program uses is the most important part of the application. Precision Mapping Streets and Traveler uses Premium Data from Tele Atlas, with coverage for the entire United States and Canada. (Early versions of Precision Mapping used Tiger Data (from the US Census) which lacked the quality and coverage of the premium data supplied from Tele Atlas.. Streets and Traveler now also includes one-way street indicators and exit ramp identification.
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