Windows® CE 3.0 Application Programming

GPS and NMEA

GPS (Global Positioning System) devices, used to obtain location fixes to an accuracy of around 100 meters, can be connected to Windows CE devices using a serial communications cable. GPS uses satellites that broadcast position and timing information, and a GPS device calculates its position using satellites that are visible at the time. GPS PCMCIA cards are also available, and these again use a serial connection to the Windows CE device. As an added advantage, GPS devices also provide a precise timing signal—some companies use GPS devices with computers to coordinate activities in different locations throughout the world.

GPS is capable of providing positional information to an accuracy of 1 to 5 meters, but the U.S. government ...