主管机关系指船旗国政府。

主管机关，英文为Administration。来自“国际海事组织”的定义。

根据国际海事组织（IMO Internatioal Maritime Organization）各公约，如《国际海上人命安全公约》等相关公约的定义：

主管机关系指船旗国政府。

Administration means the Government of the State whose flag the ship is entitled to fly.

维基百科中，则将“船旗国政府”定义为“船舶所受的法律管辖权”，船旗国负责执行海事法规。

A merchant vesselflies a flag, typically at its stern. This flag indicates the legaljurisdiction to which it is subject. For example, a vessel may fly this flag ofthe Greece; in this case the authority responsible for enforcing maritimeregulations would be the Flag Administration of Greece.