A navigation system for an electric vehicle may ascertain a selection of a charging station based on a user input, wherein a stored position of the charging station is an ultimate destination. The navigation system can ascertain a current position of the electric vehicle. In addition, the navigation system can ascertain a reachability of a target position that is separated from the current position and the stored position of the charging station. The ascertainment of reachability can be based on the current position of the electric vehicle, the stored position of the selected charging station, and the current state of charge of the energy storage device, so that the target position and subsequently the stored position of the selected charging station are reachable with the current state of charge of the energy storage device.