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Jeff, Your input settings worked for me, and match the computed navigation etc that you show. Most likely, you either have a write permission problem in your working directory, or you already have a file that exists in that directory called test.grd. Steve Chiswell Unidata User Support > I type 'oagrid'. I then enter the necessary parameters such that > when I do a 'l', I get: > > GEMPAK-OAGRID>l > GDFILE = test.grd > DELTAN = 3.76 > DELTAX = 1.88 > DELTAY = 1.88 > GRDAREA = us > EXTEND = 2;2;2;2 > DTAAREA = us- > SOURCE = sn > SNFILE = 20061029_upa.gem > SFFILE = > SNPARM = hght;thta;uwnd;vwnd;tmpc;pres > SFPARM = SKYC;TMPF;WSYM;PMSL;;DWPF;BRBK > DATTIM = 12 > LEVELS = 500 > MAXGRD = 200 > > When I type 'r' to run, I get: > > GEMPAK-OAGRID>r > > OBJECTIVE ANALYSIS PARAMETERS > > GRIDAREA 19.00 -119.00 45.32 -56.96 (us > 47.00 -56.00) DELTAN 3.760 > DELTAX 1.880 > DELTAY 1.880 > > GRID POINTS X : 34 ( 2, 2 ) Y : 15 ( 2, 2 ) > EXTENDAREA 15.24 -122.76 49.08 -53.20 > DATAAREA 5.00 -150.50 61.00 -24.50 > > Enter <cr> to accept parameters or type EXIT: > [FL -3] Cannot create file test.grd. > [DM -1] File test.grd cannot be created. > [GD -1] File test.grd cannot be created. > [GD -16] File access number is stale or invalid. > Parameters requested: GDFILE,DELTAN,DELTAX,DELTAY,GRDAREA,EXTEND,DTAAREA, > SOURCE,SNFILE,SFFILE,SNPARM,SFPARM,DATTIM,LEVELS,MAXGRD. > > How do I fix this problem? Thanks, > > Jeff > > ---------------------------------------------------------------- > This message was sent using IMP, the Internet Messaging Program. > > > Ticket Details =================== Ticket ID: ZTT-514564 Department: Support GEMPAK Priority: Normal Status: Closed