ABS (American Bureau of Shipping)
hppt://www.eagle.org/
BV (Bureau Veritas)
http://www.bureauveritas.com/
DNV (Det Norske Veritas)
http://www.dnv.com/
GL (Germanisher Lloyd)
http://www.germanlloyd.org/
KR (Korean Register of Shipping)
http://www.krs.co.kr/
LLOYD(Lloyd's Register of Shipping)
http://www.lr.org/
NK (Nippon Kaiji Kyokai)
http://www.classnk.or.jp/