Granted, Old, Old Technology, a nicety but not necessity... if I can’t see the other side of the river, I wouldn’t go out...
I have Owner’s Handbook, dated 1999.  I would like to do away with alarm beeps, on my toggle keys I can turn off the alarms, but unit keeps beeping.  I have not found a sound volume toggle (idea is to turn off sound).  Shut off the power at the fuse switches, if I push the on/off button, it will beep until it shuts down.  The only real thing I want is to know our wind speed at top of the mast when I amin the cabin (with out beeping!
Ah, to hell with the dam unit.  General weather radar on iPhone so much faster and works for what I reaaly need.  
Conclusion:  curiosity can lead to frustration!  You tube for a change has not been helpful.
just venting...