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Uno O Saki Lighthouse

Fl W 10s🇯🇵Honshu-East Coast, JPInactive

Location & Light Range

About Uno O Saki Lighthouse

This white square concrete tower stands 49 meters tall, with its light positioned 40 meters above sea level. The structure is situated on Honshu's East Coast. It was designed to emit a single white flash every 10 seconds. The lighthouse, identified by NGA list number 4496, has a geographic range of 17 nautical miles. It is no longer operational.

Light & Optic

Characteristic Signature
Fl W 10s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
10s
Raw Code
Fl.W. period 10s
Focal Height
40m
Light Range
17NM (31.5 km)
Geographic Range
17NM

Location

City
Honshu-East Coast
Country
🇯🇵JP
Latitude
37.8235°
Longitude
140.9863°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
49m
Tower Shape
square
Tower Color
white
Material
concrete

Structure: White square concrete tower; 49. JAPAN-HONSHU-EAST COAST 52

References & Identifiers

Admiralty No.
M6516
NGA No.
4496
Wikipedia
Read on Wikipedia →
Wikidata
Q11675689 →
OpenStreetMap
View on OSM →
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Frequently Asked Questions

How far offshore can Uno O Saki Lighthouse be seen?+
With a focal height of 40 meters and a nominal range of 17 nautical miles (approximately 31.5 km), Uno O Saki 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 Uno O Saki Lighthouse at night?+
Uno O Saki displays the characteristic Fl W 10s — 1 white flash every 10 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 Uno O Saki Lighthouse guide vessels into?+
Uno O Saki Lighthouse assists vessels approaching 5 nearby ports. The closest is Souma at 1.3 NM to the NW. Other ports served include Soma (1.3 NM WNW), Haramachi (9.5 NM SSE), Sendaishiogama (27.2 NM N), Satoura (29.7 NM N). Mariners should consult the relevant chart for full approach and pilotage information.
Is Uno O Saki Lighthouse still active and maintained?+
Uno O Saki Lighthouse is currently listed as inactive. It may have been decommissioned, replaced by a different navigation aid, or temporarily taken out of service. Mariners should check the latest Notices to Mariners for current status.
What shipping routes pass near Uno O Saki Lighthouse?+
Uno O Saki 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 Uno O Saki Lighthouse?+
You can track vessels near Uno O Saki 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.