Many of us have installed the G600 or G500 into our airplanes. In the Pilot Operating Handbook it states clearly that when you update your data there is a procedure to follow. I had failed to complete the task for many months when I loaded my unit with the new data. At the start up of the unit after you have installed the latest data card, a message will come up on the left screen that says " Install data update?". You must then push the ENT button on the unit and a follow up message will say "Data Update Successful". Sometimes we all forget to follow the details with this new equipment.