; Note: as of NCL V6.2.0, you don't need these load commands
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"

begin
  filename = "file.nc"
  a = addfile(filename,"r")
  u = a->u
  v = a->v 

  wks = gsn_open_wks("x11","vector_map")

  res  = True
  vector = gsn_csm_vector_map(wks,u,v,res)
end