Many hand held GPS receivers deliver time information
accurate to within 3 to 70 milliseconds via a serial cable which can be connected to your PC's RS-232 serial port. Many GPS clocks
advertise accuracy to within the nanosecond range. PresenTense Server supports both hand held GPS receivers as well as GPS clocks that
communicate via the NMEA 0183 protocol.
The benefits of hand held GPS receivers are cost effectiveness and availability - they may be purchased at many outdoor outfitters and
office supply stores in every major city. Depending on the construction of the building in which you intend to operate your time
server and GPS receiver, you might require an external antenna for your GPS to guarantee availability of satellite signals. See
Recommended Parts List