Mitty wrote:
No argument. But the original poster's idea sounded like head-down
during an approach managing airspeed as it gets updated on a GPS -- that
idea still scares me.

And it should. Fly whatever airspeed you're used to flying
non-precision approaches at (90 KIAS is typical for common trainer
types). The instrument to watch for managing airspeed is the ASI. Your
groundspeed is whatever it works out to be.