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Megishima Lighthouse

Iso W 6s🇯🇵Seto Naikai Eastern, JPOperational

Location & Light Range

About Megishima Lighthouse

This lighthouse features a white, latticed tower constructed from fiberglass. The structure stands 46 meters tall, with the light positioned at the same focal height. Its white light operates with an isophase characteristic, meaning it has equal periods of light and darkness, completing one cycle every 6 seconds. The lighthouse has a geographic range of 18 nautical miles.

Light & Optic

Characteristic Signature
Iso W 6s
Flash Type
Isophase
Light Color
White
Flash Count
1 flash
Interval
6s
Raw Code
Iso
Focal Height
46m
Light Range
14NM (25.9 km)
Geographic Range
18NM

Location

City
Seto Naikai Eastern
Country
🇯🇵JP
Latitude
34.3799°
Longitude
134.0380°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
46m
Tower Shape
latticed
Tower Color
white
Material
fiberglass

Structure: White glass reinforced plastic(grp) fiberglass structure; 10

References & Identifiers

Admiralty No.
M5539
NGA No.
8160
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Frequently Asked Questions

How far offshore can Megishima Lighthouse be seen?+
With a focal height of 46 meters and a nominal range of 14 nautical miles (approximately 25.9 km), Megishima 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 Megishima Lighthouse at night?+
Megishima 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 Megishima Lighthouse guide vessels into?+
Megishima Lighthouse assists vessels approaching 5 nearby ports. The closest is Takamatsu at 0.9 NM to the S. Other ports served include Naoshima (5.5 NM NNW), Ieura (6.8 NM N), Hibi (7 NM NW), Tamano (7.4 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Megishima Lighthouse still active and maintained?+
Yes, Megishima 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 Megishima Lighthouse?+
Megishima 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 Megishima Lighthouse?+
You can track vessels near Megishima 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.