Harman Kardon guide+play GPS-910NA Quick Start Manual page 15

Text to Speech Feature
GPS-910NA has a feature called "Text to Speech" in which navigation prompts
that appear on the screen as text can be configured to be spoken in one
of several voices (male or female). You can choose to have only directions
announced or both directions and street names. For example, the voice would
say: "In 500 feet, turn left on Lincoln Blvd. "
1
Choose
"Navigation
Settings"
2
Choose
"Voice
Settings"
3
Choose
a voice
profile
Finished!
GPS-910NA