This conversion seems to be used for a translation of maps saved in .kml to a sea chart used by MapInfo (.bsb). You have to use tools like MAPC2MPAC that support this kind of conversion. No further information about this conversion could be found, but it should be doable just fine.
Convert Google Earth Keyhole Markup language file to MapInfo sea chart.
We found one software available in the database for this conversion.
Microsoft Windows software - convert kml to bsb on Windows
A digital map conversion software
Convert from kml file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.