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Oiso Lighthouse

Fl (2) W 5s🇯🇵Seto Naikai Eastern, JPOperational

Location & Light Range

About Oiso Lighthouse

The Oiso Lighthouse stands 15 meters above sea level. It is operational and emits two white flashes every 5 seconds. This light provides a geographic range of 5 nautical miles. The lighthouse is situated in the Seto Naikai Eastern region.

Light & Optic

Characteristic Signature
Fl (2) W 5s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
5s
Raw Code
Fl.(2)W. period 5s
Focal Height
15m
Light Range
5NM (9.3 km)
Geographic Range
5NM

References & Identifiers

Admiralty No.
M5547.55
NGA No.
7904

Location

City
Seto Naikai Eastern
Country
🇯🇵JP
Latitude
34.5566°
Longitude
134.3863°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How far offshore can Oiso Lighthouse be seen?+
With a focal height of 15 meters and a nominal range of 5 nautical miles (approximately 9.3 km), Oiso 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 Oiso Lighthouse at night?+
Oiso displays the characteristic Fl (2) W 5s — 2 white flashes 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.
Which ports and harbors does Oiso Lighthouse guide vessels into?+
Oiso Lighthouse assists vessels approaching 5 nearby ports. The closest is Uchinomi at 6.5 NM to the SW. Other ports served include Sakate (7.1 NM SSW), Ikeda, Kagawa (9.3 NM WSW), Akoh (10.5 NM N), Tonosho (11.2 NM WSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Oiso Lighthouse still active and maintained?+
Yes, Oiso 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 Oiso Lighthouse?+
Oiso 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 Oiso Lighthouse?+
You can track vessels near Oiso 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.