       The EGM96 file contains geoid separations at a regular grid
       spacing of 15'x 15'.
       The EGM96 model is the result of a collaboration of theNASA
       Goddard   Space  Flight  Center,  the  National  Imageryand
       Mapping Agency and The Ohio State University.
       The  NIMA/NASA Geoid Height File consists of a 15' grid  of
       point  values  in  the tide-free system,  using  the  EGM96
       Geopotential  Model  to  degree  and  order  360.  The  WGS
       84(G873) constants were used to define the geometry and the
       normal  field of the reference ellipsoid in the calculation
       of  this  geoid  height file. For details please  refer  to
       http://cddisa.gsfc.nasa.gov/926/egm96/egm96.html.
       The EGM96.EXE file contains the interpolation and interface
       routines for using the EGM96 model together in SKI Pro. The
       routine  has  been  modified by LEICA Geosystems  Ltd  from
       Canada using the original fortran code provided by Geodetic
       Survey Division (GSD) of Canada.