Meet Remora: a car key-sized device that you can attach to your shoes, handbags, and everything in between for live GPS tracking. It is waterproof and can be used on boats. The device can be used to send safety alerts to your emergency contacts.
Remora uses GPS and a cellular antenna to communicate. It has Everyday and Athlete modes. The device has a lightweight design and comes with an impact sensor. More info is available on Kickstarter.