C501 captain reported GPS system anomalies in cruise flight near flo VOR.

Attributes
ACN	1521626
Time
Date	201802
Local Time Of Day	0601-1200
Place
Locale Reference	ZJX.ARTCC
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation I/SP (C501)
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 11000 Flight Crew Type 7000
Events
Anomaly	No Specific Anomaly Occurred All Types

Narrative:

While enroute via flo at FL190 I looked at my iphone to consult foreflight for some frequency data and noted that the time registered xf:30. My copilot noted the same reading on his iphone. This was strange because it was xa:30. While we were looking at the indications they changed to the correct time.I mention this because:1. We were too high to be receiving signals from the cell system to receive time updates so this data must have been coming from the GPS system.2. There has been an occurrence of GPS signal loss from another pilot in my local area while enroute in day/vfr conditions within the last week.I do not know if the two incidents are related but perhaps the accumulations of events like this will add to the database and help to complete a larger picture.I have experienced GPS signal loss before and the thought of someone interfering with what has become our primary navigational aid deeply concerns me. We have no backup for the GPS system since the eloran project was decommissioned some ten years ago. I believe vehemently that this project should be reactivated and completed to mitigate the vulnerability now present in our GPS system.

Original NASA ASRS Text

Title: C501 Captain reported GPS system anomalies in cruise flight near FLO VOR.

Narrative: While enroute via FLO at FL190 I looked at my iPhone to consult Foreflight for some frequency data and noted that the time registered XF:30. My copilot noted the same reading on his iPhone. This was strange because it was XA:30. While we were looking at the indications they changed to the correct time.I mention this because:1. We were too high to be receiving signals from the cell system to receive time updates so this data must have been coming from the GPS system.2. There has been an occurrence of GPS signal loss from another pilot in my local area while enroute in day/vfr conditions within the last week.I do not know if the two incidents are related but perhaps the accumulations of events like this will add to the database and help to complete a larger picture.I have experienced GPS signal loss before and the thought of someone interfering with what has become our primary navigational aid deeply concerns me. We have NO backup for the GPS system since the eLORAN project was decommissioned some ten years ago. I believe vehemently that this project should be reactivated and completed to mitigate the vulnerability now present in our GPS system.

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.