GS mini is a function of FMGS so it will need RW to calculate. If PERF page doesn't show RW and wind it will not work. Ground speed mini is a concept to keep constant energy and directional inertia. Airbus does it automatically but since we are discussing flying without any input in MCDU it should be understood that just like everything else it can be used purely manually. Use manual thrust and vary the airspeed target to keep constant ground speed threshold. That's what ATHR does.
Last edited by vilas; 26th Apr 2015 at 12:32.