To map pixel and points sizes to ground metres, GeoGateway makes the assumption that the dataset is intended to be viewed on a 1280 pixel wide screen, where each pixel is 0.28mm wide. With these values and the file's extents, GeoGateway can convert MapInfo line widths and symbol sizes to/from the RST.
Another approximation is required if the dataset's projection is LAT/LONG. In this case, GeoGateway must remap the representation information (for text height) from degrees to metres in the RST. The heights in degrees are converted as though we were dealing with a perfect sphere with a radius of 6370997m. Thus, a text height of 1 degree is approximated to 111195 metres in the RST.
Note: These limitations only apply to the RST. Datasets in LAT/LONG are imported and exported directly, without any conversion of their coordinates.