3. DON'T LEAVE PARKING UNTIL READY Those who fly in the Northeast know full well that the routes to and from another airport might not be the same. The stored GPS route thus can't be reversed for the flight home. If the clearance is a strange one, record it carefully, then store it correctly in the GPS, then call ready to taxi. Some pilots just put the first waypoint in to get started, and then load the rest of the flight once en route. That can work so long as reaching that first waypoint leaves enough time for programming, but in-flight programming is heads-down work and can be a distraction. Also, it is useful to check a new route before taxiing. Any confusion is best eliminated before the airplane moves.