Narrative:

While on a routine trip to deliver an airplane I had misset the course selector on the RMI by 10 degrees. ATC advised me, I was 3 NM south of course and gave me a vector to rejoin the airway. I was well rested and comfortable in the aircraft. The temperature was cool at 10000 ft MSL so I turned the janitrol heater on. I smelled fumes but thought nothing of it. After discovering this error I wondered if something might be mechanically wrong with the aircraft, because I had a severe headache which lasted the rest of the day. I will be reporting suspicions to maintenance tomorrow am.

Google
 

Original NASA ASRS Text

Title: A BE55 CPR PLT FLIES OFF COURSE AND SUSPECTS THAT HIS DISORIENTATION WAS CREATED BY FUMES FROM A MALFUNCTIONING HEATER.

Narrative: WHILE ON A ROUTINE TRIP TO DELIVER AN AIRPLANE I HAD MISSET THE COURSE SELECTOR ON THE RMI BY 10 DEGS. ATC ADVISED ME, I WAS 3 NM S OF COURSE AND GAVE ME A VECTOR TO REJOIN THE AIRWAY. I WAS WELL RESTED AND COMFORTABLE IN THE ACFT. THE TEMP WAS COOL AT 10000 FT MSL SO I TURNED THE JANITROL HEATER ON. I SMELLED FUMES BUT THOUGHT NOTHING OF IT. AFTER DISCOVERING THIS ERROR I WONDERED IF SOMETHING MIGHT BE MECHANICALLY WRONG WITH THE ACFT, BECAUSE I HAD A SEVERE HEADACHE WHICH LASTED THE REST OF THE DAY. I WILL BE RPTING SUSPICIONS TO MAINT TOMORROW AM.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.