B737 flight crew has 'map shift' during approach to msp.

Attributes
ACN	595971
Time
Date	200309
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : msp.airport
State Reference	MN
Altitude	msl single value : 1000
Environment
Light	Night
Aircraft 1
Controlling Facilities	tracon : ind.tracon
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 30r other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12000 flight time type : 150
ASRS Report	595971
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 16000 flight time type : 2400
ASRS Report	595185
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment : gpws aircraft equipment other aircraft equipment : nav display (nd) other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted
Consequence	other
Supplementary
Problem Areas	Navigational Facility Aircraft
Primary Problem	Ambiguous

Narrative:

I was hand flying a visual approach to runway 30R at msp and noticed a 30 degree map shift on our screens. Knowing the airport extremely well (my neighborhood), I continued the visual using PAPI and raw data. On short final over the river to runway 30R, we had the 'terrain, pull-up-pull-up' commands. Again, I continued my visual slightly above the normal GS with completely visual conditions. I was fully aware of the bogus terrain commands due to the shift of screens showing us well to the south of course. I made a normal landing on runway 30R and we called and made a logbook write-up. Supplemental information from acn 595185: on approach to msp, night VFR, FMC position was off about 10 mi and showed about 30 degrees off heading reference. Bdhi. Cap's navigation panel was on automatic. I shifted to manual and back to automatic. The heading aligned for a few seconds, and then shifted off again.

Original NASA ASRS Text

Title: B737 FLT CREW HAS 'MAP SHIFT' DURING APCH TO MSP.

Narrative: I WAS HAND FLYING A VISUAL APCH TO RWY 30R AT MSP AND NOTICED A 30 DEG MAP SHIFT ON OUR SCREENS. KNOWING THE ARPT EXTREMELY WELL (MY NEIGHBORHOOD), I CONTINUED THE VISUAL USING PAPI AND RAW DATA. ON SHORT FINAL OVER THE RIVER TO RWY 30R, WE HAD THE 'TERRAIN, PULL-UP-PULL-UP' COMMANDS. AGAIN, I CONTINUED MY VISUAL SLIGHTLY ABOVE THE NORMAL GS WITH COMPLETELY VISUAL CONDITIONS. I WAS FULLY AWARE OF THE BOGUS TERRAIN COMMANDS DUE TO THE SHIFT OF SCREENS SHOWING US WELL TO THE S OF COURSE. I MADE A NORMAL LNDG ON RWY 30R AND WE CALLED AND MADE A LOGBOOK WRITE-UP. SUPPLEMENTAL INFO FROM ACN 595185: ON APCH TO MSP, NIGHT VFR, FMC POS WAS OFF ABOUT 10 MI AND SHOWED ABOUT 30 DEGS OFF HDG REF. BDHI. CAP'S NAV PANEL WAS ON AUTO. I SHIFTED TO MANUAL AND BACK TO AUTO. THE HDG ALIGNED FOR A FEW SECONDS, AND THEN SHIFTED OFF AGAIN.

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.