Narrative:

I picked up IFR out of sgj, instructed to fly direct tmb. Then I was instructed to intercept V-3 to melbourne. Then V-437 to pahokee, turn direct briko intersection. Thence tmb. This meant from my present position, turn left. Approach said turn to 120 degrees, intercept V-3 to melbourne 10000 ft. I turned to 120 degrees navigating by LORAN/GPS and overran V-3 by 3-4 mi. Approach called and asked my heading. I replied 155 degrees. I had intercepted V-3. However, my LORAN/GPS indicated 3-4 degrees off approach heading. I then tuned in my VOR and regained v- 3 via VOR radial 161 degrees. The remedy is to always use VOR when capable reception is received and xchk LORAN by VOR indications. I should not rely solely on LORAN guidance, especially when assigned to a victor airway or jet route. Another course is to have my LORAN/GPS inspected and brought up to tolerable limits for navigation. Note: since this incident my LORAN has been placarded 'for VFR use only.' the IFR certification will be reassigned at a later date. I believe incidents such as this are learning experiences on pilot's part, but the pilot has done nothing wrong -- only followed the partial information he had (the LORAN only, and no xchk with the VOR).

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Original NASA ASRS Text

Title: AIRWAY HDG TRACK POS DEV RESULTED FROM PLT'S USE OF EQUIP THAT WAS OUT OF TOLERANCE. NAV ERROR.

Narrative: I PICKED UP IFR OUT OF SGJ, INSTRUCTED TO FLY DIRECT TMB. THEN I WAS INSTRUCTED TO INTERCEPT V-3 TO MELBOURNE. THEN V-437 TO PAHOKEE, TURN DIRECT BRIKO INTXN. THENCE TMB. THIS MEANT FROM MY PRESENT POS, TURN L. APCH SAID TURN TO 120 DEGS, INTERCEPT V-3 TO MELBOURNE 10000 FT. I TURNED TO 120 DEGS NAVING BY LORAN/GPS AND OVERRAN V-3 BY 3-4 MI. APCH CALLED AND ASKED MY HDG. I REPLIED 155 DEGS. I HAD INTERCEPTED V-3. HOWEVER, MY LORAN/GPS INDICATED 3-4 DEGS OFF APCH HDG. I THEN TUNED IN MY VOR AND REGAINED V- 3 VIA VOR RADIAL 161 DEGS. THE REMEDY IS TO ALWAYS USE VOR WHEN CAPABLE RECEPTION IS RECEIVED AND XCHK LORAN BY VOR INDICATIONS. I SHOULD NOT RELY SOLELY ON LORAN GUIDANCE, ESPECIALLY WHEN ASSIGNED TO A VICTOR AIRWAY OR JET RTE. ANOTHER COURSE IS TO HAVE MY LORAN/GPS INSPECTED AND BROUGHT UP TO TOLERABLE LIMITS FOR NAV. NOTE: SINCE THIS INCIDENT MY LORAN HAS BEEN PLACARDED 'FOR VFR USE ONLY.' THE IFR CERTIFICATION WILL BE REASSIGNED AT A LATER DATE. I BELIEVE INCIDENTS SUCH AS THIS ARE LEARNING EXPERIENCES ON PLT'S PART, BUT THE PLT HAS DONE NOTHING WRONG -- ONLY FOLLOWED THE PARTIAL INFO HE HAD (THE LORAN ONLY, AND NO XCHK WITH THE VOR).

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.