Silver Navigator now brings voice turn by turn directions to WP7 for only $3

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Silver Navigator is a new GPS navigation app in Marketplace than is based on Bing Maps.  The software initially only supported directions using an indicator sound and on-screen arrows and written directions.

The software has now received a major feature update, with the addition of Voice-based turn by turn directions.

The app is still not quite as mature as a standard GPS navigation app from TomTom or Garmin, but for $3 its a great start.

Silver Navigator can be found by searching Marketplace.