Our projection codes are different than the ESPG standard index codes. The projection code for WGS 84 in Geomatica is D000. However, that alone will not be enough. You also need to provide a coordinate system, such as UTM or Lat/Long. So for example, if you want the output to be in UTM, you need to specify UTM and select a zone and optionally a row.
For UTM the projection string might look like: UTM 9 J D000
For Long/Lat the string would look like Long/Lat D000
of course we support other options for coordinate systems, such as local systems, SPCS, etc.
I hope this helps and sorry for the delayed reply, this forum is still in its infancy