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Shimamasaki Lighthouse

Iso W 8s🇯🇵Nansei Shoto, JPOperational

Location & Light Range

About Shimamasaki Lighthouse

Shimamasaki Lighthouse is a framework tower structure. It is distinguished by a black and white checkered diamond daymark. The light emitted is white, displaying an isophase pattern on an 8-second cycle. This lighthouse has a focal height of 17 meters. Its geographic range extends to 8 nautical miles.

Light & Optic

Characteristic Signature
Iso W 8s
Flash Type
Isophase
Light Color
White
Flash Count
1 flash
Interval
8s
Raw Code
Iso.W. period 8s
Focal Height
17m
Light Range
8NM (14.8 km)
Geographic Range
8NM

Location

City
Nansei Shoto
Country
🇯🇵JP
Latitude
30.4666°
Longitude
130.8495°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Color
white and black

Structure: Framework tower, black and white checkered diamond (rhombus) daymark

References & Identifiers

Admiralty No.
M4793
NGA No.
13028
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Frequently Asked Questions

How far offshore can Shimamasaki Lighthouse be seen?+
With a focal height of 17 meters and a nominal range of 8 nautical miles (approximately 14.8 km), Shimamasaki 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 Shimamasaki Lighthouse at night?+
Shimamasaki displays the characteristic Iso W 8s — 1 white flash every 8 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 Shimamasaki Lighthouse guide vessels into?+
Shimamasaki Lighthouse assists vessels approaching 5 nearby ports. The closest is Shimama at 0.7 NM to the E. Other ports served include Kadokura (7.4 NM S), Hamatsuwaki (9.7 NM NNE), Suwa (9.7 NM NNE), Makigawa (11 NM NNE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Shimamasaki Lighthouse still active and maintained?+
Yes, Shimamasaki 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 Shimamasaki Lighthouse?+
Shimamasaki 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 Shimamasaki Lighthouse?+
You can track vessels near Shimamasaki 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.