  Sub-relativistic magnetic monopoles are predicted from the GUT era by theory.
To date there have been no confirmed observations of such exotic particles. The
Iron CALorimeter (ICAL) at India-based Neutrino Observatory (INO) aims to
measure the neutrino oscillation parameters precisely. As it is a tracking
detector there is also the possibility of detecting magnetic monopoles in the
sub-relativistic region. Using ICAL the magnetic monopole event is
characterised by the large time intervals of upto 30 microsec between the
signals in successive layers of the active detectors. The aim of this study is
to identify the sensitivity of ICAL for a particle carrying magnetic charge in
the mass range from 10^{5} to 10^{17} GeV with beta ranging from 10^{-5} to 9 x
10^{-1} for ICAL at INO. A similar study has also been carried out for the ICAL
prototype which will be placed overground. Due to the rock cover of
approximately 1.3 km, ICAL at INO will not be able to place bounds on the flux
of the lower mass magnetic monopoles. This mass region is however addressed by
the prototype ICAL.
