The Pharos CompactFlash Adapter allows the GPS receiver of the Microsoft Streets and Trips with GPS Locator Package to be used as a portable GPS receiver. Connect to your laptop, Tablet or Pocket PC via the CompactFlash type I or II slot. Use it for hiking, walking tours or other outdoor activities, as well as for your in-car navigation needs. For added flexibility, use the GPS receiver with the CF extension cable (included) for placement and reception. There is no need for an external antenna. The CompactFlash Adapter will truly let you get the most out of your iGPS-500 receiver with it's portability and flexibility.