[jerlam]

A voice app might be ideal for a subset of these groups, but my experience observing others using voice interfaces has not been encouraging. Many people, especially the elderly, are hard of hearing, have an accent that is misunderstood by technology, and/or speak with a incompatible cadence. People also need time to process the response, but with voice it's happening at the device's timeframe, not the user's.

[Fatnino]

I have a friend who is... slow.

He uses a dedicated GPS device in his car and it speaks directions very slowly. Seems to work for him.

[jerlam]

Thanks, I just remembered that there's a setting on my phone to control the speed of speech.

A GPS application seems like a tough place to use it, because it's time critical.