C210 pilot deviated from course and altitude.

Attributes
ACN	420400
Time
Date	199811
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ssi airport : ssi
State Reference	FL
Altitude	msl bound lower : 1600 msl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other descent : approach descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 20 flight time total : 900 flight time type : 400
ASRS Report	420400
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

En route from cae to sav checking navaids, I ended up about 10-12 mi left of course when tuning in sav to ssi. Corrected the deviation and proceeded to brunswick (ssi). I noted changing and conflicting information on #1 and #2 obs indicators and then conflict with GPS. I tried to go to ssi and hold, but had 2 different readings. I contacted jax. They wondered what the problem was. I finally turned off #2 and used HSI. GPS oriented to course and in the confusion, busted altitude 1800 ft to 1600 ft. Corrected this -- mostly used ADF and flew approach. I was over ssi airport, canceled IFR, broke out and landed. I thought I had some bizarre radio/obs problem, but when I was on the ground a comanche pilot stated he had received changing +/- confusing readings from ssi VOR.

Original NASA ASRS Text

Title: C210 PLT DEVIATED FROM COURSE AND ALT.

Narrative: ENRTE FROM CAE TO SAV CHKING NAVAIDS, I ENDED UP ABOUT 10-12 MI L OF COURSE WHEN TUNING IN SAV TO SSI. CORRECTED THE DEV AND PROCEEDED TO BRUNSWICK (SSI). I NOTED CHANGING AND CONFLICTING INFO ON #1 AND #2 OBS INDICATORS AND THEN CONFLICT WITH GPS. I TRIED TO GO TO SSI AND HOLD, BUT HAD 2 DIFFERENT READINGS. I CONTACTED JAX. THEY WONDERED WHAT THE PROB WAS. I FINALLY TURNED OFF #2 AND USED HSI. GPS ORIENTED TO COURSE AND IN THE CONFUSION, BUSTED ALT 1800 FT TO 1600 FT. CORRECTED THIS -- MOSTLY USED ADF AND FLEW APCH. I WAS OVER SSI ARPT, CANCELED IFR, BROKE OUT AND LANDED. I THOUGHT I HAD SOME BIZARRE RADIO/OBS PROB, BUT WHEN I WAS ON THE GND A COMANCHE PLT STATED HE HAD RECEIVED CHANGING +/- CONFUSING READINGS FROM SSI 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.