On occasion, when traveling to a station where Suica is not supported, the card must be handed over to the staff at the exiting station, so that they can calculate the remaining fare and return a slip of paper which must be given to the staff at the next station where Suica is used. Since the system keeps track of when a card enters and leaves a station, if the records show that the card had entered a station but not left (due to the situation such as described above, or technical malfunctions), the station staff can reset the card.