Why Is GPS Important?

GPS is important because it saves your time during travel in car on by foot. You can easily find any point of interest (like shop, hotel, restaurant) when visiting city for first time. You can also save position of hotel where you stay during vacation, where you parked your car in city or where lives your friend.
More advanced devices can avoid traffic jam and help you keep optimal speed for less fuel consumption. You can also import speed cams like POIs and save some dollar.
IT is hard to list all benefits, you should try.