PA-30 pilot reported a GPS malfunction led to an airspace violation.

Attributes
ACN	1514952
Time
Date	201801
Local Time Of Day	0601-1200
Place
Locale Reference	MTW.Airport
State Reference	MN
Environment
Light	Daylight
Aircraft 1
Make Model Name	PA-30 Twin Comanche
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	None
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Multiengine Flight Crew Private
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 500 Flight Crew Type 30
Events
Anomaly	Aircraft Equipment Problem Less Severe Airspace Violation All Types Deviation - Procedural FAR

Narrative:

I inadvertently went into restricted airspace R-6903 (northern side) due to a GPS malfunction. Once I realized I was in restricted airspace I immediately proceeded directly north to [navigate] out of the restricted airspace; then proceeded to my destination. I think this could [have] been avoided if I would have used two forms of navigation to verify my location.

Original NASA ASRS Text

Title: PA-30 pilot reported a GPS malfunction led to an airspace violation.

Narrative: I inadvertently went into restricted airspace R-6903 (northern side) due to a GPS malfunction. Once I realized I was in restricted airspace I immediately proceeded directly north to [navigate] out of the restricted airspace; then proceeded to my destination. I think this could [have] been avoided if I would have used two forms of navigation to verify my location.

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.