Part way into the flight I had a concern on my fuel reserve. This was to be my longest leg and I had carefully planned the fuel I would require taking into account planned headwinds at this altitude. It was now I realised that my reserve fuel had slowly been counting down. It started at 82 litres and was now down to 33 and falling. I still had several hours of flying left, this was not great news as there were limited places to land in the desert. I kept going through my head what was going on as it didn’t make sense, my airspeed vs ground speed indicated that the head wind was within the limits I had set. The flight time vs distance travelled seemed ok. With risk of losing my current position I decided to do a reset on the GPS. 77 litres reserve appeared on the screen ! So what had happened, it seemed that although the gps knew where I was the fuel computer still thought I was in Cairo !! I probably should have read the manual a bit better !
