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Tateyama Ko Lighthouse

Fl G 3s🇯🇵Honshu-South Coast-Tokyo Wan, JPOperational

Location & Light Range

About Tateyama Ko Lighthouse

This mast lighthouse stands 11 meters tall with a focal height of 11 meters. Its tower is painted green, and the structure itself is described as a white tower, numbered 26. The light emitted is green and follows an isophase pattern, providing a geographic range of 11 nautical miles. It is operational and located on the south coast of Honshu, within Tokyo Bay.

Light & Optic

Characteristic Signature
Fl G 3s
Flash Type
Flashing
Light Color
Green
Flash Count
1 flash
Interval
3s
Raw Code
Iso
Focal Height
11m
Light Range
5NM (9.3 km)
Geographic Range
11NM

Location

City
Honshu-South Coast-Tokyo Wan
Country
🇯🇵JP
Latitude
34.9877°
Longitude
139.8480°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
11m
Tower Shape
mast
Tower Color
green

Structure: White tower; 26

References & Identifiers

Admiralty No.
M6451
NGA No.
5012
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Frequently Asked Questions

How far offshore can Tateyama Ko Lighthouse be seen?+
With a focal height of 11 meters and a nominal range of 5 nautical miles (approximately 9.3 km), Tateyama 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 Tateyama Ko Lighthouse at night?+
Tateyama Ko displays the characteristic Fl G 3s — 1 green flash every 3 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 Tateyama Ko Lighthouse guide vessels into?+
Tateyama Ko Lighthouse assists vessels approaching 5 nearby ports. The closest is Tateyama at 1.1 NM to the N. Other ports served include Muya (2.5 NM WNW), Wada (8.7 NM ENE), Maguchi (12.5 NM NW), Abuto (13.6 NM ENE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Tateyama Ko Lighthouse still active and maintained?+
Yes, Tateyama 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 Tateyama Ko Lighthouse?+
Tateyama 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 Tateyama Ko Lighthouse?+
You can track vessels near Tateyama 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.