On 16 October 1597, thirteen Korean ships defeated a Japanese fleet of three hundred and thirty-three at the Myeongnyang Strait. The numerical ratio is the line that gets cited. The substance is the method.
Yi Sun-sin had read the strait. He had calculated the tidal reversal window — six hours during which the current would be against the Japanese advance and with the Korean line. He positioned the thirteen ships where the environment would do most of the kinetic work for him.
Four centuries later, NATO writes a doctrine called Intelligence Preparation of the Battlefield — ATP-2.1.1, JP 2-01.3 in the joint form. The doctrine has a name now. Yi did not have the name. He executed the doctrine anyway.
The strait as an environmental schema
The Myeongnyang Strait is a tidal pinch point — narrow channel, strong currents, sharp reversal at six-hour intervals. To Yi it was both a force multiplier and a constraint. To his admiralty it was a schema: a structured representation of an environment that supplied predictable variables (current direction, current magnitude, time windows) the operator could plan around.
A strait is, in modern terms, a low-altitude airspace analogue. Predictable variables (migration windows, atmospheric corridors, sensor coverage), sharp transitions, exploitable structure. The methodology Yi used in 1597 is the methodology AVIX-AI uses in 2026 against the same geography.
What he calculated
Yi calculated three things publicly recorded in Nanjung Ilgi (난중일기, War Diary):
- Tidal-reversal time. Yi knew the current would reverse during the engagement window. He chose the engagement time, not the enemy.
- Channel width effect. The Japanese could not bring more than ~12 ships into the channel simultaneously. The 333-ship fleet was reduced to a 12-on-13 engagement.
- Position-relative-to-environment. He anchored his line so the reversal would carry the Japanese against their own advance.
That is an IPB product. It has a doctrinal name now (JIPOE, per JP 2-01.3). The 1597 form had no name. The methodology was identical.
What he did not have
A doctrine reference library. A schema. A catalog he could publish his reading into. Allied operators who could inherit the analytical primitives. A sensor stack to make the environmental telemetry machine-readable.
He had to read the strait personally. The reading died with him, substantially. Nanjung Ilgi preserves the calculation; the methodology was not encoded for re-use.
What we are doing now
_uamkt_extensions exists because the methodology should be encoded
for re-use. Every entity we publish that carries a
_uamkt_extensions:doctrine_ref tag is a primitive Yi did not have
the surface to encode against. Every habitat profile is an
environmental schema. Every pre-indicator payload is a tidal calculation
extended into a new medium.
The doctrine is not new. It is what we now call IPB. Yi just did it.
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Inquiries: ceo@uamkt.com
Primary reference: 이순신 (1597). 난중일기 — 정유년 9월 16일 (Nanjung Ilgi, War Diary, 16 September 1597 lunar calendar).