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You can choose the directions format:
Read directions as text.
Touch Show on map to see the directions on a map.
Touch Navigate to get spoken, turn-by-turn directions from Google
Maps Navigation.
When you’re finished, press the Menu Key and touch More >
Clear Map to clear the map.
Navigating with Spoken, Turn-by-turn Directions
You can use Google Maps Navigation to get turn-by-turn driving
directions, both spoken and displayed on your screen.

To navigate with turn-by-turn directions

Get directions to a location, then touch Navigate in the Directions
screen.
OR
Google Maps