Mercator Projections?

[Graeme Rae]

I've seen a couple of references in the archives to being able to either do a Mercator projection by
adjusting the ylevels or using a version of GrADS that has this built in.  Has anyone successfully done
either of these?  Any help would be greatly appreciated.

The data sets I have are all in  Lat/Lon/Variable format, but I need to display them on a 'standard'
rectangular Mercator grid;  linear Lon, but variable spaced lat.

Thanks!

Graeme