PA23-250 pilot was cleared RNAV direct. Reporter used LORAN to identify the intersection, but VOR didn't agree with LORAN. Reporter had the RNAV selected on the LORAN receiver instead of the VOR. When he followed the LORAN the aircraft was still off course until the controller intervened and gave a vector.

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Attributes
ACN	400440
Time
Date	199804
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : omn
State Reference	FL
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dab
Operator	general aviation : personal
Make Model Name	PA-23-250 Turbo Aztec
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : direct enroute other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument pilot : cfi
Experience	flight time last 90 days : 35 flight time total : 1100 flight time type : 35
ASRS Report	400440
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was cleared RNAV direct to an intersection, then follow the victor airway to the VOR. I used LORAN to get to the intersection. When LORAN said I was there, the VOR said I wasn't. I chose to follow the VOR indication believing it would be more accurate. My RNAV receiver was in RNAV mode when I thought it was in VOR mode. I flew off course. The controller had to correct me. Cause: lack of experience with RNAV.

Original NASA ASRS Text

Title: PA23-250 PLT WAS CLRED RNAV DIRECT. RPTR USED LORAN TO IDENT THE INTXN, BUT VOR DIDN'T AGREE WITH LORAN. RPTR HAD THE RNAV SELECTED ON THE LORAN RECEIVER INSTEAD OF THE VOR. WHEN HE FOLLOWED THE LORAN THE ACFT WAS STILL OFF COURSE UNTIL THE CTLR INTERVENED AND GAVE A VECTOR.

Narrative: I WAS CLRED RNAV DIRECT TO AN INTXN, THEN FOLLOW THE VICTOR AIRWAY TO THE VOR. I USED LORAN TO GET TO THE INTXN. WHEN LORAN SAID I WAS THERE, THE VOR SAID I WASN'T. I CHOSE TO FOLLOW THE VOR INDICATION BELIEVING IT WOULD BE MORE ACCURATE. MY RNAV RECEIVER WAS IN RNAV MODE WHEN I THOUGHT IT WAS IN VOR MODE. I FLEW OFF COURSE. THE CTLR HAD TO CORRECT ME. CAUSE: LACK OF EXPERIENCE WITH RNAV.

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.