  The India-based Neutrino Observatory (INO) will host a 50 kt magnetized iron
calorimeter (ICAL@INO) for the study of atmospheric neutrinos. Using the
detector resolutions and efficiencies obtained by the INO collaboration from a
full-detector GEANT4-based simulation, we determine the reach of this
experiment for the measurement of the atmospheric neutrino mixing parameters
($\sin^2 \theta_{23}$ and $|\Delta m_{32}^2 |$). We also explore the
sensitivity of this experiment to the deviation of $\theta_{23}$ from maximal
mixing, and its octant.
