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Aio Kō Lighthouse

Iso R 4s🇯🇵Yamaguchi, JPOperational

Location & Light Range

About Aio Kō Lighthouse

This lighthouse is situated in Yamaguchi and is currently operational. It stands with a focal height of 12 meters above sea level. The light emits a single red flash. This flash repeats every 3 seconds, marking its characteristic pattern.

Light & Optic

Characteristic Signature
Iso R 4s
Flash Type
Isophase
Light Color
Red
Flash Count
1 flash
Interval
4s
Raw Code
Fl.R. period 3s
Focal Height
12m
Geographic Range
3NM

References & Identifiers

Admiralty No.
M5390.45
NGA No.
9616

Location

City
Yamaguchi
Country
🇯🇵JP
Latitude
34.0089°
Longitude
131.4273°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Aio Kō Lighthouse at night?+
Aio Kō displays the characteristic Iso R 4s — 1 red flash every 4 seconds. Each lighthouse has a unique flash pattern published in the List of Lights, allowing mariners to positively identify it and distinguish it from other navigation aids in the area. The red color may indicate a specific sector or warning zone.
Which ports and harbors does Aio Kō Lighthouse guide vessels into?+
Aio Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Aio at 0.3 NM to the W. Other ports served include Hofu (3.2 NM ENE), Maruo (4.4 NM WSW), Nakanoseki (6.3 NM E), Mitajiri (8.5 NM E). Mariners should consult the relevant chart for full approach and pilotage information.
Is Aio Kō Lighthouse still active and maintained?+
Yes, Aio Kō Lighthouse is currently operational. It is actively maintained and continues to emit its characteristic light signal for marine navigation. Most modern lighthouses are automated and monitored remotely by the national maritime authority.
What shipping routes pass near Aio Kō Lighthouse?+
Aio Kō Lighthouse is located within the Japan / Korea shipping lane — a busy shipping corridor linking the major ports of Japan and South Korea. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Aio Kō Lighthouse?+
You can track vessels near Aio Kō Lighthouse in real time using MarineRadar. The platform shows live AIS positions of ships in the area, including vessel name, type, flag, speed, and course. Use the "Track Vessels Nearby" button on this page to open the live map centered on this lighthouse.