B737 pilot crew reported the IRU's would not align; resulting in a rejected takeoff.

Attributes
ACN	1739000
Time
Date	202003
Local Time Of Day	0601-1200
Place
Locale Reference	BWI.Airport
State Reference	MD
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Position Computing System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

We were cleared for takeoff on runway 15R at bwi. I was the pilot flying. When we lined up on the runway the data in my [display] did not look accurate. I elected to vacate the runway. We assessed the information and were re-cleared for take off with no further issue.

Original NASA ASRS Text

Title: B737 pilot crew reported the IRU's would not align; resulting in a rejected takeoff.

Narrative: We were cleared for takeoff on Runway 15R at BWI. I was the Pilot Flying. When we lined up on the runway the data in my [display] did not look accurate. I elected to vacate the runway. We assessed the information and were re-cleared for take off with no further issue.

Data retrieved from NASA's ASRS site 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.