2-33  To aid in the approach chart/database correlation process,  the FAA has begun a program to assign five-letter names  to CNFs and to chart CNFs on various National Oceanic  Service aeronautical products. [Figure 2-55] These CNFs  are not to be used for any ATC application, such as holding  for which the fix has not already been assessed. CNFs are  charted to distinguish them from conventional reporting  points, fixes, intersections, and waypoints. A CNF name is  enclosed in parenthesis, e.g., (MABEE) and is placed next  to the CNF it defines. If the CNF is not at an existing point  defined by means such as crossing radials or radial/DME,  the point is indicated by an X. The CNF name is not used in  filing a flight plan or in aircraft/ATC communications. Use  current phraseology (e.g., facility name, radial, distance) to  describe these fixes.  of DME arcs, and sensor final approach fixes (FAFs) on some  GPS overlay approaches.  An integral part of RNAV using en route charts typically  involves the use of airborne navigation databases.  Because GPS receivers are basically “to-to” navigators,  they must always be navigating to a defined point. On  overlay approaches, if no pronounceable five-character  name is published for an approach waypoint or fix, it has  been given a database identifier consisting of letters and  numbers. These points appear in the list of waypoints in the  approach procedure database, but may not appear on the  approach chart. A point used for the purpose of defining  the navigation track for an airborne computer system (i.e.,  GPS or FMS) is called a Computer Navigation Fix (CNF). CNFs  include unnamed DME fixes, beginning and ending points  depicted on a Severe Weather Avoidance Plan (SWAP) en  route chart. These waypoints and SWAP routes assist pilots  and controllers when severe weather affects the East Coast.  Computer Navigation Performance  Figure 2-54. Floating waypoints. 