  The Gaia mission will provide an unprecedented 3D view of our galaxy, it will
obtain astrometric, photometric and spectrographic data for roughly one billion
stars. We are particularly interested in the treasure chest of new data Gaia
will produce for hot subdwarf B (sdB) stars. In order for Gaia to classify sdBs
and estimate parameters model spectra covering a wide parameter range are
needed. Here we describe the construction of an extensive grid, which will be
used for this purpose.
