The 1st Naval Armaments Supplement Programme, 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.
IJN cruisers Mogami, Mikuma, Kumano all constructed under the "Circle One" plan
The 2nd Naval Armaments Supplement Programme otherwise known as the "Circle 2 Plan" was the second of four expansion plans of the Imperial Japanese Navy between 1930 and the start of World War II.
1st Naval Armaments Supplement Programme
…the Circle One plan, additional funding was added for the construction of three more vessels: the submarine tender Taigei, and two submarine chasers. 2nd Naval Armaments Supplement Programme (Maru 2 Keikaku, 1934) 3rd Naval Armaments Supplement Programme (Maru 3 Keikaku, 1937…
Construction of the cruiser Tone was authorized under the "Circle-2 Plan"