SirfGPSTweaker is a freeware (Pocket PC or Windows) application for displaying output from NMEA or SIRFBINARY based GPS device. It has autodetection of data format (so it works both in NMEA or SIRF with on the fly detection).
It can display statistics and data panel for cockpit use. Cockpit mode includes history graphs for speed and altitude. Programm is able to tweak GPS receivers by changing the operation mode or resetting the device.