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In this poster we present three developments related to the Galactic O-StarSpectroscopic Survey (GOSSS). First, we are making public the first version ofMGB, an IDL code that allows the user to compare oberved spectra to a grid ofspectroscopic standards to measure spectral types, luminosity classes, rotationindexes, and spectral qualifiers. Second, we present the associated grid ofstandard stars for the spectral types O2 to O9.7, with several improvementsover the original GOSSS grid of Sota et al. (2011). Third, we present a list ofegregious classification errors in SIMBAD: stars that are or have been listedthere as being of O type but that in reality are late-type stars.

MGB and the new Galactic O-Star Spectroscopic Survey spectral classification standard grid