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Sado Osaki Lighthouse

Fl W 6s🇯🇵Honshu-Northwest Coast, JPOperational

Location & Light Range

About Sado Osaki Lighthouse

This white tower stands 31 meters tall, situated on the Honshu-Northwest Coast. The lighthouse emits a single green flash every 3 seconds. Its geographic range is limited to 3 nautical miles. The focal plane of the light is also 31 meters above sea level.

Light & Optic

Characteristic Signature
Fl W 6s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
6s
Raw Code
Fl.G. period 3s
Focal Height
31m
Light Range
16NM (29.6 km)
Geographic Range
3NM

Location

City
Honshu-Northwest Coast
Country
🇯🇵JP
Latitude
38.0941°
Longitude
138.2502°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
31m
Tower Color
white

Structure: White tower; 31. JAPAN-HONSHU-NORTHWEST COAST 39 (1)

References & Identifiers

Admiralty No.
M7106.2
NGA No.
3258
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Frequently Asked Questions

How far offshore can Sado Osaki Lighthouse be seen?+
With a focal height of 31 meters and a nominal range of 16 nautical miles (approximately 29.6 km), Sado Osaki is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. Lights of this range are typically used as landfall lights by vessels approaching from the open sea.
How do mariners identify Sado Osaki Lighthouse at night?+
Sado Osaki displays the characteristic Fl 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 Sado Osaki Lighthouse guide vessels into?+
Sado Osaki Lighthouse assists vessels approaching 5 nearby ports. The closest is Futami, Niigata at 7 NM to the S. Other ports served include Ryotsu (9.1 NM E), Shirose (9.8 NM ENE), OTA (15.5 NM SE), Akadomari (15.6 NM SSE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Sado Osaki Lighthouse still active and maintained?+
Yes, Sado Osaki 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 Sado Osaki Lighthouse?+
Sado Osaki 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 Sado Osaki Lighthouse?+
You can track vessels near Sado Osaki 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.