http://repeater-finder.com/what_is_arf.html

Todd describes features which help accessibility.


Well, it has some features that may help.  First, it will announce
selected menu item numbers using Morse if you enable that in the system.
Next, it can also optionally announce the call sign of each repeater in
the list, as you move amongst them with the encoder. This works in
either "overview" or "detail" mode.  While driving (or moving in
general), it can also announce your speed periodically using Morse if
you select that menu item.

The Morse features are configurable for:

1. Speed (up to 50 WPM if I recall).
2. "Sidetone" frequency.  
3. Farnsworth timing.

As for general sounds:

1. Each time the encoder is rotated in menus, a soft short beep is
emitted.  The beep that is emitted on the *first* item of each list is
of a different frequency, so you can always tell when you've reached the
first item.

2. When you press the encoder to select a menu item, ARF can either emit
no sound at all, sound the item number in Morse, or beep the number of
times representing the menu item #.

3. When scanning, the unit chirps each time a new repeater is
displayed/configured.

4. When the unit powers up, it sounds out "ARF" in Morse.  Not useful,
but definitely Ham-centric!

5. Each time a search occurs (at the user-defined rate), ARF emits a
short, distinctive beep pattern (two quick beeps), this lets you know
when searches complete.

All that said, it isn't completely usable without looking.  I'm always
open to suggestions though, since I'm sure I don't think about these
things the way that someone with an impairment would.