detailed imperial navy order
Historical term for a detailed operational order issued by the Imperial Japanese Navy General Staff. Contrasts with 大海令 (general navy order).
See also: 大海令
The 大海指 was a document that gave concrete operational instructions based on the 大海令.
Compound of 大海 (imperial navy) and 指 (directive, instruction). The exact historical derivation is uncertain; the term is specific to the Imperial Japanese Navy.