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Katsuyama Ko Lighthouse

Iso G 4s🇯🇵Honshu-South Coast-Tokyo Wan, JPOperational

Location & Light Range

About Katsuyama Ko Lighthouse

This square masonry tower stands 12 meters tall and is painted red. Its focal plane is 11 meters above sea level. The lighthouse emits an isophase green light. This light has a geographic range of 8 nautical miles.

Light & Optic

Characteristic Signature
Iso G 4s
Flash Type
Isophase
Light Color
Green
Flash Count
1 flash
Interval
4s
Raw Code
Iso
Focal Height
11m
Light Range
4NM (7.4 km)
Geographic Range
8NM

Location

City
Honshu-South Coast-Tokyo Wan
Country
🇯🇵JP
Latitude
35.1105°
Longitude
139.8260°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
12m
Tower Shape
square
Tower Color
red
Material
masonry

Structure: White square tower

References & Identifiers

Admiralty No.
M6445.5
NGA No.
5036
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Frequently Asked Questions

How far offshore can Katsuyama Ko Lighthouse be seen?+
With a focal height of 11 meters and a nominal range of 4 nautical miles (approximately 7.4 km), Katsuyama Ko is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. As a shorter-range light, it primarily serves nearshore and coastal traffic.
How do mariners identify Katsuyama Ko Lighthouse at night?+
Katsuyama Ko 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 Katsuyama Ko Lighthouse guide vessels into?+
Katsuyama Ko Lighthouse assists vessels approaching 5 nearby ports. The closest is Tateyama at 6.4 NM to the S. Other ports served include Muya (6.8 NM S), Kazusaminato (6.8 NM NNE), Maguchi (7.5 NM WNW), Kurihama (8.5 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Katsuyama Ko Lighthouse still active and maintained?+
Yes, Katsuyama Ko 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 Katsuyama Ko Lighthouse?+
Katsuyama Ko 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 Katsuyama Ko Lighthouse?+
You can track vessels near Katsuyama Ko 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.