flying smooth
er, that should read -
halve the ground speed and add a zero.
(or halve the first two figures of the gnd spd and add two zeros)
Having your vs more in your approach instrument scan is v important, the last glance being at the 100' call approaching the threshold to ensure everything vertical is under control. Flying the vs helps avoid 'chasing' the glideslope indication and the overcorrection that invariably results.