Shoppers are walking around with little homing devices in their pockets, better known as smartphones. Retailers like Nordstrom love the idea of using the phones to track your movement as you walk up and down their aisles as your activity provides valuable shopping data and a chance to offer coupons. But some people, including Sen. Al Franken, are less impressed with this idea and don’t want to be followed. Now, there is a proposed solution from the industry in the form of a code of conduct: participating companies say they will post a sign in stores to alert shoppers to the tracking and also provide a way for shoppers to opt out. Forbes has more details, including the helpful tip that you can avoid much of this in the first place by turning off your WiFi and Bluetooth.