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Allow to use a projection which doesn't squeeze the map horizontally, to make vector map compatible with raster maps with a typical projection.
Example map - Finnish border outline by vector map on top of background raster map
Example map in attached file (raster from National Land Survey of Finland 6/2012) shows how much the map is squeezed in the north by GpsMid (the outline country border drawn from vector data from OSM by GpsMid).
GpsMid changes the stretch/squeeze of the map when panning the map in north/south direction.
Sorry, writing escaped when attaching the file; should be for a projection "which doesn't squeeze the map in the vertical, north-south direction"