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Dainikaiho Lighthouse

Fl WR 5s🇯🇵Honshu-South Coast-Tokyo Wan, JPOperational

Location & Light Range

About Dainikaiho Lighthouse

This white metal framework tower stands 16 meters tall, with its light positioned 20 meters above sea level. The structure emits a white or red flash every 5 seconds, visible for 13 nautical miles. It is located on the southern coast of Honshu, near Tokyo Bay.

Light & Optic

Characteristic Signature
Fl WR 5s
Flash Type
Flashing
Light Color
WR
Flash Count
1 flash
Interval
5s
Raw Code
Fl.W.R. period 5s
Focal Height
20m
Light Range
13NM (24.1 km)
Geographic Range
13NM

Location

City
Honshu-South Coast-Tokyo Wan
Country
🇯🇵JP
Latitude
35.3118°
Longitude
139.7415°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
16m
Tower Shape
round
Tower Color
white
Material
metal

Structure: White metal framework tower; 16

References & Identifiers

Admiralty No.
M6368
NGA No.
5092
Wikidata
Q126735480 →
OpenStreetMap
View on OSM →
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Frequently Asked Questions

How far offshore can Dainikaiho Lighthouse be seen?+
With a focal height of 20 meters and a nominal range of 13 nautical miles (approximately 24.1 km), Dainikaiho is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. This range makes it a significant coastal navigation aid for vessels transiting the area.
How do mariners identify Dainikaiho Lighthouse at night?+
Dainikaiho displays the characteristic Fl WR 5s — 1 wr flash every 5 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 wr color may indicate a specific sector or warning zone.
Which ports and harbors does Dainikaiho Lighthouse guide vessels into?+
Dainikaiho Lighthouse assists vessels approaching 5 nearby ports. The closest is Yokosuka at 2.9 NM to the WSW. Other ports served include Hayama (4 NM WSW), Uraga (4.3 NM S), Hamakanaya (4.9 NM SSW), Kurihama (5.4 NM S). Mariners should consult the relevant chart for full approach and pilotage information.
Is Dainikaiho Lighthouse still active and maintained?+
Yes, Dainikaiho 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 Dainikaiho Lighthouse?+
Dainikaiho 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 Dainikaiho Lighthouse?+
You can track vessels near Dainikaiho 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.