Hi Larry, I decided to ask Steve Chiswell, as I was returning his document anyway. The NEXRAD data does not need to be decoded to be viewed in either GEMPAK or MCIDAS. It's already in a raster format and is ready to be displayed. FYI. Anne -- *************************************************** Anne Wilson UCAR Unidata Program address@hidden P.O. Box 3000 Boulder, CO 80307 ---------------------------------------------------- Unidata WWW server http://www.unidata.ucar.edu/ ****************************************************