Use world file (.pgw) for map calibration
I use raster maps in Locus often. Every time I change a map I have to go through calibration procedure. This is long and not so precise.
Multiple mapping tools when exporting raster maps produce world (.pgw) file that contains required calibration data. It would be good to use these files in Locus instead of manual calibration.
I use OpenOrienteering mapper mostly.