Cessna Citation Sovereign (C680)
Flight Crew Commercial
Other / Unknown
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
Operating VFR with own navigation in the west practice area; flying the ZZZ ILS XX. Notified Approach we would be turning off GPS and changing our callsign. Approach acknowledged the change and we updated the flight ID accordingly. Upon completion of the GPS off testing we notified Approach we were complete with the GPS off portion of the flight and updated the flight ID. Approach switched back to the original callsign. We identified the non-compliance during discussion with the safety officer a week later. We should have been operating under the '[letter]' callsign for the duration of the flight. Clarify the guidance / LOA / SOPs regarding GPS off testing.
[Report narrative contained no additional information.]
CE-680 pilots reported not following SOP for testing the GPS.