Uav operator reported possible operation in class C airspace.

Attributes
ACN	1588688
Time
Date	201810
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	UAV - Unpiloted Aerial Vehicle
Route In Use	Visual Approach
Flight Plan	VFR
Person 1
Function	Pilot Not Flying
Events
Anomaly	Airspace Violation All Types Deviation - Procedural Published Material / Policy Deviation - Procedural FAR

Narrative:

This pertains to a small uav flight near [the] state university. We took all usual protocols & procedures to check airspace and confirm we are clear to safely fly. For this particular flight; we checked to confirm we were outside of the class C airspace of ZZZ airport and checked for tfr's in the area - all came back clear. However; we may have flown in or near the class C airspace during this brief flight and it was discovered after flight was over. Moving forward; we will use https://skyvector.com/ and https://uas-faa.opendata.arcgis.com/ to check instead of B4UFly app.

Original NASA ASRS Text

Title: UAV operator reported possible operation in Class C airspace.

Narrative: This pertains to a small UAV flight near [the] State University. We took all usual protocols & procedures to check airspace and confirm we are clear to safely fly. For this particular flight; we checked to confirm we were outside of the Class C airspace of ZZZ Airport and checked for TFR's in the area - all came back clear. However; we may have flown in or near the Class C airspace during this brief flight and it was discovered after flight was over. Moving forward; we will use https://skyvector.com/ and https://uas-faa.opendata.arcgis.com/ to check instead of B4UFly app.

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.