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Kusatsu Lighthouse

Iso G 4s🇯🇵Okayama and Hiroshima, JPOperational

Location & Light Range

About Kusatsu Lighthouse

The Kusatsu Lighthouse features a white tower standing 28 meters tall. Its focal plane is situated 11 meters above sea level. The lighthouse emits a green light, characterized by an isophase pattern that repeats every 4 seconds. This structure provides a geographic range of 5 nautical miles. The lighthouse is operational and managed from Japan.

Light & Optic

Characteristic Signature
Iso G 4s
Flash Type
Isophase
Light Color
Green
Flash Count
1 flash
Interval
4s
Raw Code
Iso.G. period 4s
Focal Height
11m
Geographic Range
5NM

Location

City
Okayama and Hiroshima
Country
🇯🇵JP
Latitude
34.3613°
Longitude
132.3985°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
28m
Tower Color
white

Structure: White tower; 28

References & Identifiers

Admiralty No.
M5683
NGA No.
9028
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Frequently Asked Questions

How do mariners identify Kusatsu Lighthouse at night?+
Kusatsu displays the characteristic Iso G 4s — 1 green 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Kusatsu Lighthouse guide vessels into?+
Kusatsu Lighthouse assists vessels approaching 5 nearby ports. The closest is Hiroshima at 1.3 NM to the SE. Other ports served include Chitose, Hiroshima (3.4 NM ESE), Fukae, Hiroshima (3.4 NM ESE), Kawajiri, Hiroshima (3.4 NM ESE), Nakahama, Hiroshima (3.4 NM ESE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Kusatsu Lighthouse still active and maintained?+
Yes, Kusatsu 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 Kusatsu Lighthouse?+
Kusatsu 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 Kusatsu Lighthouse?+
You can track vessels near Kusatsu 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.