Whats SPM, ? Found help , horizon hobbies, they say no solution . The radio keep playing the speed status according to the time you set 5 sec 10 sec etc.. You cannot designate a sw. to shut it off or on. Sounds ridiculus So to have speed update by sound
you have to listen to it every 5 , 10 15 sec or what ever you set. I was looking for it to aid in landing speed only not the whole flight,
If you leave the sound off it reads on your display, guess you spotter has to look and tell you your speed. not so good?
Any body have a way around this? Rich B.