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Ashikashima Lighthouse

Fl W 3s🇯🇵Honshu-South Coast-Tokyo Wan, JPOperational

Location & Light Range

About Ashikashima Lighthouse

Ashikashima lighthouse is a concrete structure standing 15 meters tall. Its focal height is also 15 meters. The tower has a white, lantern shape. It emits a white flash with a characteristic of Fl. This navigational aid is classified as an isolated danger under IALA A. The structure includes a black post, a black topmark, and is banded in red.

Light & Optic

Characteristic Signature
Fl W 3s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
3s
Raw Code
Fl
Focal Height
15m
Light Range
7NM (13.0 km)
Geographic Range
11NM

Location

City
Honshu-South Coast-Tokyo Wan
Country
🇯🇵JP
Latitude
35.2121°
Longitude
139.7351°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
15m
Tower Shape
lantern
Tower Color
white
Material
concrete

Structure: ISOLATED DANGER (IALA A) Black post, black topmark, red banded

References & Identifiers

Admiralty No.
M6355
NGA No.
5056
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Frequently Asked Questions

How far offshore can Ashikashima Lighthouse be seen?+
With a focal height of 15 meters and a nominal range of 7 nautical miles (approximately 13.0 km), Ashikashima 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 Ashikashima Lighthouse at night?+
Ashikashima displays the characteristic Fl W 3s — 1 white flash every 3 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 Ashikashima Lighthouse guide vessels into?+
Ashikashima Lighthouse assists vessels approaching 5 nearby ports. The closest is Kurihama at 1 NM to the NW. Other ports served include Hamakanaya (1.6 NM NW), Uraga (1.8 NM NNW), Maguchi (5 NM SW), Yokosuka (5.3 NM NNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ashikashima Lighthouse still active and maintained?+
Yes, Ashikashima 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 Ashikashima Lighthouse?+
Ashikashima 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 Ashikashima Lighthouse?+
You can track vessels near Ashikashima 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.