參考:
"The GPS macro-component TIM provides complete GPS signal processing from antenna input to serial data output (NMEA or SiRF® proprietary data format). A second serial port accepts differential GPS data (RTCM)."
further reading: http://www.u-blox.com/en/press-and-events/press-release-archive/736-u-blox-introduces-the-fully-self-contained-low-cost-gps-receiver-macro-component-tim.html