• We have the concept of a 'charge location'. This is an area (square, because it is easiest) around a GPS location. An area of 200m x 200m, centred on the charge location, should be sufficient for gps inaccuracies. Up to 5 such charge locations can be defined (I'm thinking home, work, and one other).
• Once the car enters a charge location, an action can be triggered. At the moment, I'm only thinking of automatic home link activation, but others are possible.