We present analysis of commissioning $M-$band data acquired with the infrared echelle spectrograph (iSHELL) on {it NASAs Infrared Telescope Facility}. In this paper we describe the delivered performance of the instrument for these $M-$band observations and the data reduction process. The feasibility of using iSHELL for spectro-astrometry is tested on the Herbig Ae/Be star HD~179218 and we show that sub-milliarcsecond fidelity is achievable.
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