In one embodiment, the geofence can dynamically be adjusted in size or shape according to a working mode of the EV 10. For example, when determining the geofence for the EV 10, the processor 110 of the emergency subscriber 100 dynamically changes the shape or size of the geofence based on the working mode of the EV 10. The working mode of the EV 10 can be selected (or determined) at the EV 10 or the remote management server 20.
In one embodiment, the working mode of the EV 10 can be selected (or determined) in a manual manner by a user selection input through an input device 140 of the emergency subscriber device 100, which will be described with reference to