What is this part responsible for? The one behind the sticker in Galaxy S3
While it's not clearly identified what this specific sticker is and covers, based on this teardown, it does look as though the chip is on the direct other side of the board from the connector that touches the component on that sticker, suggesting the connector is directly attached through the board to that chip. So my instinct is that you're correct that it's related to the GPS. I cannot confirm this without a doubt, but everything lines up.