The navigation used for the AREA data is that of the native signal documentation. In McIDAS terminology, it is a GMSX navigation type, as opposed to some previous GMS ingestors which used a GOES navigation type. The McIDAS navigation block in the AREA is the same as the navigation sent in the GMS documentation except for some zero-fill data. For exact location of the words, see the McIDAS Programmer's Manual . Data in floating point representation has not been modified from the form it was transmitted in, and it has not been endian-modified.