MathInfo uses both BSB and 3TF file types. So it might be possible that it can convert data from each other.
Convert MapInfo sea chart to MapInfo graph file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert bsb to 3tf on Windows
MapInfo is mapping application for Microsoft Windows. It is used to visualize the relationships between data and geography. MapInfo gives users the tools to examine and demonstrate the relationship between geography and data thanks to its powerful analytical and geoprocessing tools.
Convert from bsb file
to 3tf file
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.