1st Naval Armaments Supplement Programme

The 1st Naval Armaments Supplement Programme (マル1計画, 第一次補充計画, Maru 1 Keikaku, Dai-Ichi-Ji Hojū Keikaku), otherwise known as the "Circle One" plan was the first of four expansion plans of the Imperial Japanese Navy between 1930 and the start of World War II.

The London Naval Treaty placed severe restrictions on Japan's naval capabilities vis-a-vis the United States Navy and the British Royal Navy in terms of tonnage and numbers of capital warships.

The response of the Imperial Japanese Navy General Staff was to initiate a construction program to build new warships to the allotted tonnage limits in each of the restricted categories, and to invest in types of warships and weaponry not specifically covered by the provisions of the treaty.

[1] The "Circle One" plan was submitted by the Naval Ministry and approved by the Cabinet in November 1930, and officially ratified by the Diet of Japan in 1931.

Attention was also given to training of pilots and air crews in dive bombing and torpedo tactics.