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For Radio navigation aid, PANS-AIM requires some basic properties as part of the minimum AIP data set. These are
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makes a distinction only for NDB. The Enroute NDB NAVAID file (DB) contains all enroute on-airway and off-airway NDBs. The Terminal NDB NAVAID file (PN) contains NDBs associated with the Airports and Heliport (see also section Aerodrome Served below). If a NDB is used in both the terminal and enroute environments, it appears in the Enroute NDB NAVAID (DB) file.
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The Navaid.name is used for the long name given to the composite navaid. For the name of the navaid, maximum 60 upper case alpha and/or numerical characters and also some special characters may be used.
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. Some navaids will have no name.
Aerodrome Served
Navaids of type VOR, DME, NDB, TACAN and Marker with purpose Aerodrome (A or AE) or used for terminal procedures (generally published in AIP section AD 2.19/3.18) will be assigned to one (or more) AirportHeliport.
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