Since we choose not to collect any location data due to privacy concerns, we don't use GPS, so we can’t tell you where you were exposed. However, we will be able to tell you on which day you were exposed.
We recognize that this involves some privacy trade-offs, since if you receive an alert that you were exposed on a day where you were within six feet of very few people, you may be able to deduce who shared their test results.
We think the benefits of knowing when you were exposed outweigh the privacy risks of deduction. Anyone concerned about deduction can choose not to share their diagnosis. Everyone is in full control of what is shared and when.