1) YesDoes this offer voice prompts for turn by turn directions?
Is it a practical substitute for a car navigation system?
Or, is it more for pedestrians in an unfamiliar environment?
2) Yes (the data all comes from online though, so if you lose connection... it won't work... I didn't see any option to download map data to the phone like the Android version has)
3) There are walking options as well as driving directions and public transportation routes