The law regulating the use of force at sea has long been due fora reevaluation in the light of developments in methods and means of warfare at sea and the fact that major changes have taken place in other branches of international law of direct relevance to this issue. This need was reflected in Resolution VII of the 25th International Conference of the Red Cross, which noted that “some areas of international humanitarian law relating to sea warfare are in need of reaffirmation and clarification on the basis of existing fundamental principles of international humanitarian law” and therefore appealed to “governments to co-ordinate their efforts in appropriate fora in order to review the necessity and the possibility of updating the relevant texts of international humanitarian law relating to sea warfare”.

The San Remo Manual was prepared during the period 1988–1994 by a group of legal and naval experts participating in their personal capacity in a series of Round Tables convened by the International Institute of Humanitarian Law. The purpose of the Manual is to provide a contemporary restatement of international law applicable to armed conflicts at sea. The Manual includes a few provisions which might be considered progressive developments in the law but most of its provisions are considered to state the law which is currently applicable. The Manual is viewed by the participants of the Round Tables as being in many respects a modern equivalent to the Oxford Manual on the Laws of Naval War Governing the Relations Between Belligerents adopted by the Institute of International Law in 1913. A contemporary manual was considered necessary because of developments in the law since 1913 which for the most part have not been incorporated into recent treaty law, the Second Geneva Convention of 1949 being essentially limited to the protection of the wounded, sick and shipwrecked at sea. In particular, there has not been a development for the law of armed conflict at sea similar to that for the law of armed conflict on land with the conclusion of Protocol I of 1977 additional to the Geneva Conventions of 1949. Although some of the provisions of Additional Protocol I affect naval operations, in particular those supplementing the protection given to medical vessels and aircraft in the Second Geneva Convention of 1949, Part IV of the Protocol, which protects civilians against the effects of hostilities, is applicable only to naval operations which affect civilians and civilian objects on land.

On 9 December 1994 the United Nations General Assembly adopted by consensus the Convention on the Safety of United Nations and Associated Personnel. In so doing it completed a process of codification and progressive development of international law at an unusually fast pace, considering that the Ad Hoc Committee entrusted by the 48th General Assembly (1993) with drafting the Convention took less than nine months to complete its task.