As far as I know, bmp files (like jpeg and gif and probably others)
only support ESRI World files. This is not a true CRS definition
though, it only indicated the geotransform.
Even though it is not standard, it would be convenient to update these
drivers to read an associated .prj file
I am using GDAL to convert CADRG files to BMP chips for an application written
to only use BMP. I have created the BMP chip, BMP world file and a 4326 prj
file to indicate WGS 84. When I use gdalinfo to look at the settings it always
indicates CRS is not defined. QGis also says the CRS is