Or 2 to figure out why the geotiff conversions dont work?
i have succes with mapc2mapc, geotiff to sqliteLite.
download attached example sqlite and copy it to locus/mapshttps://www.dropbox.com/s/nm9p15hygzyxcri/400-78W.sqlitedb?dl=0
requirement for mapc2mapc is installed GDAL on your PC, so download and install e.g. "gdal-201-1600-x64-core.msi"
run mapc2mapc, open Edit/Locate/GDAL_translate, navigate to your GDAL folder and select gdal_translate.exe and confirm.
> File/ load calibrated map/select a geotiff file
> File/write map for mobil devices/ set zoomlevels and confirm each
enjoy a cup of coffee