Car Locater concept

I've been conceptualising a watch app that helps find your car in a parking lot.

The variant on the left is designed to utilise bluetooth connection strength for proximity detection, but I reckon that wouldn't be too useful given the paltry range of bluetooth. The other variant attempts to utilise GPS to convey the general direction in which your car is with approximate distance to it, this would work in tandem with an on-board chip on the vehicle, just a concept as of now though.