Originally Posted by
172_driver
The Vref may change a knot or so between the brief and final approach. If you're unhappy with one knot difference then just update the PFD speed. Takes 2 button pushes. My opinion.
True...FWIW a slightly different Boeing in question but FWIW our training department/management has just decreed, in the interests of minimising FMC punching after TOD, that one should select Vref at the briefing stage and then barring any major events such as a go-around leave it alone...