Broadcom says it's invented a chip that can tell your phone where you are all the time without quickly draining your battery. The BCM47521 chip, which will be demonstrated at Mobile World Congress next week, should make it easier to use apps that react to the user's location, said Richard Najarian, senior director of business development for GPS at Broadcom. That could include tools that mute an employee's ringer when they enter the office, send a text message when a child leaves school grounds, or tell a retailer when a loyal shopper is near a store.