What was found
BRIEFLY SMELLED SOMETHING BURNING FOR ABOUT 30 SEC THEN LOST NAV CRS LN. SMELL WAS AT CRUISE LOST NAVIGATION TRACK AND HAD TO SWITCH TO SECOND ROUTE ON NAV COMPUTER. NO PROBLEM WITH NAV NOW. (UPDATE FROM FLIGHT CREW, PEKMM PLEASE HAVE PILOTS FILL OUT A SMOKE ODOR FORM AND SEND BACK TO TOMC) NO SMOKE SIGN SHOWED IN FLT DECK AND E&E COMPARTMENT. BRIEFING WITH PILOTS, ROUT2 WORKING FINE AFT ROUT1 BLANK. RESET IRS AND COMMUNICATION MASTER SWITCH, RELOAD FLT PLAN INDICATIONS NORMAL.