Developed in cooperation with a defence customer the trajectory below was recorded from a portable 0.23kg unit including GPS and dead-reckoning sensors. FSL were contracted to design and manufacture a micro-controller with firmware integrating both the GPS and dead-reckoning sensors to compute a position and output data to a command and control system. 
The micro-controller is approximately the size of a small book of matches and contains numerous serial ports and an Atmel processor capable of computing navigational positions from a CA or P/Y code GPS receiver and dead-reckoning sensors.

The micro also has programmed logic to accept or reject navigation data dependant upon advanced quality control procedures. The unit takes 3.3VDC power and provides conditioned 5VDC power if required.
A typical position plot is shown where the navigation data was computed by both satellite navigation and dead-reckoning sensors. Red trails indicate GPS while blue trails indicate dead-reckoning. The system is able to tolerate long periods out of GPS coverage without significant degradation of overall accuracy.