areas within a certain radius of the present location of the aircraft 11 etc when the u201c logical location u201d selection 26 is selected this may provide information as to navaids airways procedures etc which are upcoming within a predetermined distance along the flight path of the aircraft 11 the u201c now next u201d approach such information could also be represented by elements that are relevant to the flight plan for example an aircraft might fly close to a particular element but that element or chart might not be relevant to the flight plan as a specific example a wide body commercial jet e g boeing 747 aircraft might fly over a small field that has an instrument approach but is far too small for the aircraft to make use of thus even while the particular element is near the flight path the particular element is still not pertinent to the type of aircraft or its current flight plan the u201c status of operation u201d selection 28 pertains to relevant documents such as checklists procedures etc pertaining to operations to be performed by the crew during different phases of operation of the aircraft 11 the u201c status of operation u201d selection 28 may also involve emergency procedures that may become relevant if an emergency condition should develop e g one engine goes out by selecting two or more of selections 22 28 the user can implement two or more layers of filtering for example if the u201c physical or geographic location u201d selector 24 is selected along with the u201c status of operation u201d selection 28 then a limited subset of information pertaining to for example airports within a flight range for a current fuel load of the.