About GPS receivers
With a Global Positioning System (GPS) receiver connected to your computer or Pocket PC, you can see your current location on the MapPoint or Pocket Streets map. When you have a GPS receiver installed, MapPoint and Pocket Streets checks for your location once every second and displays it on the map. You can choose to have the map always centered on your current location. Using the GPS Sensor, you can also view the latitude and longitude coordinates of your current location.
To work with MapPoint or Pocket Streets, your GPS receiver must be compliant with NMEA (National Marine Electronics Association) standards, and its input/output format (interface) must be set to support the NMEA 0183 version 2.0 or later format. For more details, check the documentation that came with your receiver, or visit http://www.nmea.org/.
How GPS receivers work
GPS receivers take in data from the Global Positioning System, a constellation of 24 satellites orbiting the earth. The satellites were developed and launched by the United States Department of Defense at a cost of more than $12 billion. This system is the most advanced navigational technology ever developed. It can provide your precise latitude and longitude, altitude, and speed; the direction in which you are moving; and the time anywhere on Earth, in any weather, at any time. Because a GPS receiver must track data from at least three satellites at once, it must have a direct line of sight to the sky at any given time you are using it.
More information
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See your current location using GPS
Troubleshoot using a GPS receiver
Install or uninstall Pocket Streets