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Udosaki Lighthouse

Fl (2) W 6s🇯🇵Kyushu-East Coast, JPOperational

Location & Light Range

About Udosaki Lighthouse

This concrete square tower stands 20 meters high on the Kyushu-East Coast. It displays a daymark with white, black, and green bands and a green triangle pointing upward. The lighthouse emits two white flashes every 6 seconds. Its light is visible for 7 nautical miles. The structure's focal height reaches 45 meters above sea level.

Light & Optic

Characteristic Signature
Fl (2) W 6s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
6s
Raw Code
Fl.(2)W. period 6s
Focal Height
45m
Light Range
7NM (13.0 km)
Geographic Range
7NM

Location

City
Kyushu-East Coast
Country
🇯🇵JP
Latitude
31.6456°
Longitude
131.4679°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
20m
Tower Shape
square
Tower Color
white and black and green
Material
concrete

Structure: White pile beacon, black banded, green triangle, point up daymark; 20

References & Identifiers

Admiralty No.
M4876
NGA No.
10804
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Frequently Asked Questions

How far offshore can Udosaki Lighthouse be seen?+
With a focal height of 45 meters and a nominal range of 7 nautical miles (approximately 13.0 km), Udosaki 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 Udosaki Lighthouse at night?+
Udosaki displays the characteristic Fl (2) W 6s — 2 white flashes every 6 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.
Which ports and harbors does Udosaki Lighthouse guide vessels into?+
Udosaki Lighthouse assists vessels approaching 5 nearby ports. The closest is Aburatsu at 5.3 NM to the SW. Other ports served include Uchiumi (6.6 NM N), Meitsu (7.5 NM SW), Tonoura (9 NM SSW), Aoshima (9.2 NM N). Mariners should consult the relevant chart for full approach and pilotage information.
Is Udosaki Lighthouse still active and maintained?+
Yes, Udosaki 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 Udosaki Lighthouse?+
Udosaki 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 Udosaki Lighthouse?+
You can track vessels near Udosaki 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.