I have geo-referened TIFF files (WGS 84 UTM zone 57S) and corrected GPS data (WGS 84 lat/long). When I display both of these in a desired polar stereographic (WGS 84, -71 deg. Latitude of true scale) projection, they are out by 100-200 m of each other. Possible inaccuracies in the data should be <20 m for geoTIFFs and <1 m for GPS data, therefore I believe and have been advised that it is a spatial reference/projection issue.
Will converting the WGS 84 UTM files to WGS 84 lat/long, instead of just forcing the UTM files into a stereographic display projection solve this problem?