Does Google MAPS allow an auto input for a GPS location to get directions?

ie: directions for where a person is standing to a restaurant? I’ve got the restaurant located but I want them to be able to touch a button on the screen that auto enters their GPS postion. Many people in city areas don’t even know where the are. Also, they have to input a name, address, city and zip to get the directions feature to work.

Any ideas?

Thanks!