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Iioka Lighthouse

Iso W 6s🇯🇵Honshu-East Coast, JPOperational

Location & Light Range

About Iioka Lighthouse

This operational lighthouse is situated on Honshu's East Coast. It emits an isophase white light that repeats on a 6-second cycle. The light source is positioned at a focal height of 74 meters above sea level. The lighthouse provides a visual range of 12 nautical miles.

Light & Optic

Characteristic Signature
Iso W 6s
Flash Type
Isophase
Light Color
White
Flash Count
1 flash
Interval
6s
Raw Code
Iso.W. period 6s
Focal Height
74m
Light Range
12NM (22.2 km)
Geographic Range
12NM

References & Identifiers

Admiralty No.
M6477
NGA No.
4796
Wikidata
Q11666309 →

Location

City
Honshu-East Coast
Country
🇯🇵JP
Latitude
35.6931°
Longitude
140.7395°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How far offshore can Iioka Lighthouse be seen?+
With a focal height of 74 meters and a nominal range of 12 nautical miles (approximately 22.2 km), Iioka 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 Iioka Lighthouse at night?+
Iioka displays the characteristic Iso W 6s — 1 white flash 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 Iioka Lighthouse guide vessels into?+
Iioka Lighthouse assists vessels approaching 5 nearby ports. The closest is Naarai at 5.9 NM to the ENE. Other ports served include Takada (5.9 NM ENE), Choshi (6 NM ENE), Kashima, Ibaraki (13.3 NM NNW), Futtsu, Chiba (18.6 NM WSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Iioka Lighthouse still active and maintained?+
Yes, Iioka 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 Iioka Lighthouse?+
Iioka 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 Iioka Lighthouse?+
You can track vessels near Iioka 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.