updated 05:40 pm EDT, Mon October 23, 2006
Proporta Solar GPS unit
Proporta is selling the Solar Bluetooth GPS Receiver, a somewhat unusual device in that it doesn't display data on its own screen; instead, it sends information to Bluetooth-enabled PDAs and smartphones. The screen has been replaced with a solar panel that "trickle-charges" the battery in both direct and ambient light. A drained receiver can be fully charged in about four hours using the included car adapter. If users have a TomTom GO, that can be used to provide planning and multilingual vocal directions. The Solar Bluetooth costs $110.