Helicopter pilot reported mistakenly flying into sts class D airspace due to a GPS accuracy error.

Attributes
ACN	1433926
Time
Date	201703
Local Time Of Day	0601-1200
Place
Locale Reference	STS.Airport
State Reference	CA
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Helicopter
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	VFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Commercial Flight Crew Rotorcraft
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 600 Flight Crew Type 180
Events
Anomaly	Aircraft Equipment Problem Less Severe Airspace Violation All Types Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

GPS accuracy issue. I was notified I had appeared in the airspace of sts during IFR/IMC; and was asked to leave which I did promptly.

Original NASA ASRS Text

Title: Helicopter pilot reported mistakenly flying into STS Class D airspace due to a GPS accuracy error.

Narrative: GPS accuracy issue. I was notified I had appeared in the airspace of STS during IFR/IMC; and was asked to leave which I did promptly.

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.