cplot :
   This routine uses the NCAR Graphics library to create a filled
   contour plot of hycom model fields. 

cvplot :
   This routine uses the NCAR Graphics library to create a filled
   contour plot + a vector plot of hycom model fields. 

On hexagon:  module load ncl_ncarg-pgi/5.0.0

TODO: More info here
export NCARG_ROOT='/local/ncl_ncarg-5.0.0-pgi/lib'