What was found
(CAN) CREW REPORTED THAT THERE WAS BURNING SMELL AND FOLLOWED SHORTLY BY WISPS OF SMOKE COMING FROM AREA TO THE CAPTAINS SIDE OF CENTER CONSOLE, JUST UNDER HIS INSTRUMENT PANEL. CREW WAS UNABLE TO IDENTIFY SOURCE OF SMOKE, AND CARRIED OUT PROCEDURES IAW QRH UNIDENTIFIED SMOKE, AND RETURNED TO BASE. CREW CONFIRMED SMOKE STOPPED FOLLOWING QRH PROCEDURES. ENGINEERING FOUND CIRCUIT BREAKER RNAV 1 ON AVIONICS CB PANEL POPPED LOCATION G4. FMS CONTROLLER/COMPUTER WAS REMOVED, INSPECTED WITH A STRONG SMELL OF BURNING EMANATING FROM UNIT. WIRING IN GENERAL AREA WAS INSPECTED FOR DAMAGE, AND POWER SUPPLIES AND GROUND VALUES WERE CHECKED FOR PROBLEMS, NONE FOUND. FAULTY FMS UNIT HAS BEEN REMOVED FOR INVESTIGATION.