%N coaltprj %F $MIR/src/subs/co.for
%D Translate a non-standard CAR projection.
%P mrc
%: coordinates
%B
      subroutine coAltPrj(lu)
      include 'mirconst.h'

      integer lu
  ---------------------------------------------------------------------
  Translate the oft-used, non-standard implementation of the CAR
  projection.  This is essentially a simple linear axis pair except
  with an implicit cos(lat0) rescaling on longitude.

  The coordinate object should already have been initialized by a call
  to coInit or coReinit, or have been created by coDup or coRaDec.  It
  will be reinitialized if necessary.

  This routine could also be extended to handle the non-standard
  definition of the AIT and MER projections given by AIPS memo 46.
  Note that there is no contention for NCP or GLS which are handled as
  first-class projections by coReinit, i.e. not translated to SIN or
  SFL (except within WCSLIB).

  Input:
    lu         Handle of the coordinate object.
