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After confirming different values between GDLIST and GDPOINT I suspect GDPOINT needs some updating. There were some updates to the grid diagnostic routines in 2009-2010 that may not be accounted for at this time. If GDPOINT is not essential for you here, I suggest not using it. if it is essential, it will take me a couple of days, I think, to find the problem, fix it, test it and get back to you with an update. -Michael > Hi Michael, > > Thanks for getting back to me! I'm using gfunc = mag(grad(thta)) > Ticket Details =================== Ticket ID: CEW-233266 Department: Support GEMPAK Priority: Normal Status: Open