Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 122; Flight Crew Total 1679; Flight Crew Type 964
Situational Awareness; Confusion; Human-Machine Interface
Aircraft Equipment Problem Less Severe
Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification
ATC Equipment / Nav Facility / Buildings; Aircraft; Human Factors; Software and Automation
On initial climb out at approximately 1;000 ft. my Garmin GTN635 GPS notified me that terrain awareness was unavailable and was in dead reckoning mode. Shortly after this I checked in with Albuquerque Center when they notified me of the GPS jamming in White Sands research area restricted area 5107B. I informed Albuquerque Center that I was unable to maintain my own terrain obstruction clearance and they put me on an IFR flight plan at that time. My portable Garmin 695 had about half the signal it normally does and I was able to use it to marginally navigate. Being unfamiliar with this area and possibly a different avionics configuration I feel my flight could have possibly ended as controlled flight into terrain.
A Pilot reported GPS jamming.