(13) A shipboard voter who arrives in the Republic of Korea before the commencement date of the period for shipboard voting may vote at the polling station installed at the voting district having jurisdiction over his or her domicile after filing a report with the competent Gu/Si/Gun election commission, accompanied with documents prescribed by the National Election Commission Regulations. In such cases, a person who has received in advance a ballot paper for shipboard voting on board the relevant ship shall return the same ballot paper when he or she files a report with the competent Gu/Si/Gun election commission. <Newly Inserted on Aug. 13, 2015> (14) The procedure for shipboard voting, technical requirements for facsimile for ensuring the secrecy of voting, preparation and submission of the records of management of shipboard voting and the register of management of shipboard ballot papers, procedure for voting by shipboard voters who arrive in the Republic of Korea before the commencement date of the period for shipboard voting, and other necessary matters shall be prescribed by the National Election Commission Regulations. <Amended on Aug. 13, 2015> [Moved from Article 158-2; previous Article 158-3 Deleted <Jan. 17, 2014>] Article 159 (Method of Marking on Ballot) An eligible voter, upon putting a mark on the ballot paper, shall use the marking device on which the mark "" is carved: Provided, That a home voter who votes at his or her place of residence (including shipboard voting) may put the mark "". <Amended on Feb. 29, 2012> Article 160 Deleted. <Aug. 4, 2005> Article 161 (Voting Observation) (1) The officials in charge of voting management shall have the voting observers witness the ballot paper issuing and the balloting. <Amended on Aug. 4, 2005> (2) The voting observers shall be selected by a political party, a candidate, the election manager or the chief of the election campaign liaison office in proportion of two persons for each candidate by polling station and a written report thereon shall be sent to the Eup/Myeon/Dong election commission by two days before the election day. <Amended on Aug. 4, 2005> (3) Voting observers shall be comprised of eight persons for every polling station, but if the number of persons selected and reported under paragraph (2) exceeds eight, those designated by the Eup/Myeon/Dong election commission by lottery shall be the observers: Provided, That if observers are not selected or the number of selected and reported persons is fewer than four, those who are selected up to four persons by the Eup/Myeon/Dong election commission shall be the observers upon consenting, from among eligible voters residing in the Gu/Si/Gun having jurisdiction over the relevant voting district. <Amended on Mar. 12, 2004; Aug. 4, 2005; Jan. 25, 2010> (4) Where the Eup/Myeon/Dong election commission designates voting observers under paragraph (3), one person for each candidate shall be first selected, if the number of candidates exceeds eight, and