Startup Idea: Real-Time Child Tracking Device

Startup idea to develop a sophisticated, real-time child tracking system in form of a bracelet or wearable device with online accessible location history. It should provide precise location data with time stamps for parents to monitor their children's whereabouts.

I am a stay at home mom. I would like a tracking device like a bracelet or something small to track my kids locations. It should be accurate within a few feet and have a strong signal. I would like to access their location online so I can see where they are. History of location would also be helpful with time stamps.