Pilot's must go through pre-flight checklists and consider the aircraft's limitations versus the flight requirements. Pilots should be evaluating themselves as well, to ensure they aren't contributing to risks. For example, a pilot's health, mental state, and experience are crucial components of a safe journey. The last entry of the 5 P checklist is programming, which reminds a pilot to verify things like their route and navigation points in their GPS system. GPS is just one aspect of how pilots see at night, so it's critical to verify the system is functioning properly.