3-44 Chapter Summary Navigation has been freed from the constraints of channeling  all flight traffic along one path. The area navigation  capabilities found in advanced avionics receiving signals  from other than conventional line‑of‑sight ground‑based  aviation navaids and the compact size and reliability of  microchips now allow efficient, accurate air travel. Integrated  databases facilitated by large reliable memory modules  help you to select routes, approaches, and avoid special use  airspace. With this freedom of movement, you must expend more  time learning the system and how to do the preflight entries  or programming. In addition to current charts, you must now  verify the currency of the advanced avionics databases. The  aircraft owner must also allocate the funding to maintain the  currency of the databases. Since advanced avionics have different displays, navigation  sources, functions, and features, the pilot must always be  aware of the mode selected, the data source(s), and the  function selected. Pilot lack of attention to navigation can  have dire consequences, including notification of the next  of kin. You now have access to a tremendous amount of data. The  methods of data selection and display must be learned and  then decisions made about which display formats to use at  which times. VOR/DMEs are simple receivers to tune and  use. To use current flight management systems and area  navigation units, you may need to study books that are  larger than the actual units themselves. You must know the  quality of maintenance for advanced avionics units and the  qualifications of the systems to determine appropriate uses  of the equipment.