In last months "Test Pilot" section of AOPA magazine one of the questions was about whether an aircraft logbook entry was required for the IFR GPS database update. I will admit that I learned something new. I guess it is required under part 43 appendix A (preventative maint.) I was just curious if I was the only one in the dark on that? I had never heard of anyone doing this. I guess I can get good info from "Test Pilot" besides useless and interesting trivia.