Trace is currently a design concept, shaped as a wearable jewelry. The device contains a recorder for GPS data and vibrator. It shall vibrate, when the wearer revisits a location, where the GPS data was logged onto the device, the device vibrates to remind users about her/his past journey at the other time.
Reference: Carpenter, V.J. & Overholt, D. 2018. Designing for interpersonal connections in future technologies: An annotated portfolio of jewelry devices. NordDesign.