Capture current location on Google form

Hi, I want to capture the current location of the person submitting my google form. I have a business, and my sales person needs to go to the customer place and collect information. When my sales person submits the google form I want to make sure my sales person submits the form from the customer place only. So I need to capture the location of the sales person from where he is submitting the form. I have the google form with the questions ready with me now.