diff --git a/sorc/cpld_gridgen.fd/grdvars.F90 b/sorc/cpld_gridgen.fd/grdvars.F90
index a3abad291..431b76a4f 100644
--- a/sorc/cpld_gridgen.fd/grdvars.F90
+++ b/sorc/cpld_gridgen.fd/grdvars.F90
@@ -163,8 +163,9 @@ module grdvars
                                                                    !! rounded to minimum_depth
   real(kind=real_kind), parameter :: maximum_lat = 88.0            !< The maximum latitude for water points for WW3
 
-  integer, parameter :: nar = 6                                                !< the number of possible ATM resolutions
-  integer, parameter, dimension(nar) :: catm = (/48, 96, 192, 384, 768, 1152/) !< the ATM resolutions for mapped ocean masks
+  integer, parameter :: nar = 3                                                !< the number of possible ATM resolutions
+  integer, parameter, dimension(nar) :: catm = (/12, 18, 24/) !< the ATM resolutions for mapped ocean masks
+
 
 contains
   !> Allocate grid variables
diff --git a/ush/cpld_gridgen.sh b/ush/cpld_gridgen.sh
index 9bb08109a..8155a3657 100755
--- a/ush/cpld_gridgen.sh
+++ b/ush/cpld_gridgen.sh
@@ -20,7 +20,7 @@ export RESNAME=${RESNAME:-$1}
 export DEBUG=.false.
 export MASKEDIT=.false.
 export DO_POSTWGTS=.true.
-export MOSAICDIR_PATH=${MOSAICDIR_PATH:-$PATHTR/fix/orog}
+export MOSAICDIR_PATH=${MOSAICDIR_PATH:-$PATHTR/fix/orog.lowres}
 export FIXDIR_PATH=${MOM6_FIXDIR}/${RESNAME}
 
 APRUN=${APRUN:-"srun"}