The model  of  the  ferroin  catalyzed  Belousov-Zhabotinsky
    reaction is modified for temperature band 10-30 C  that  is 
    more convenient in experiment. In the explored concentration
    range,  a vortex rotates around a stationary circled-shaped
    core.  However, in an inhomogeneous  medium  it  drifts 
    along  the  boundary  of inhomogeneity.  For   all   measured
    spiral wave parameters computations fit experiments well.