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Shirono Lighthouse

Iso W 6s🇯🇵Kōchi (Southern Shikoku), JPOperational

Location & Light Range

About Shirono Lighthouse

Shirono Lighthouse stands in Kōchi on the southern part of Shikoku island. Its tower is painted in distinctive red and yellow bands. The light emits an isophase white signal that completes a full cycle every 6 seconds. The structure has a focal height of 57 meters above sea level and a geographic range of 8 nautical miles.

Light & Optic

Characteristic Signature
Iso W 6s
Flash Type
Isophase
Light Color
White
Flash Count
1 flash
Interval
6s
Raw Code
Iso.W. period 6s
Focal Height
57m
Geographic Range
8NM

Location

City
Kōchi (Southern Shikoku)
Country
🇯🇵JP
Latitude
33.4303°
Longitude
133.4619°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Color
red and yellow

Structure: Red and yellow tower. W. 154°-198°, R.-225°, W.- 334°, R.-154°

References & Identifiers

Admiralty No.
M5596.3
NGA No.
10188
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Frequently Asked Questions

How do mariners identify Shirono Lighthouse at night?+
Shirono displays the characteristic Iso 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 Shirono Lighthouse guide vessels into?+
Shirono Lighthouse assists vessels approaching 5 nearby ports. The closest is Usa/Tosa at 1.2 NM to the NW. Other ports served include Kochi (8.3 NM NE), Susaki (8.7 NM WSW), Kaminokae (14.1 NM SW), Saga (27.6 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Shirono Lighthouse still active and maintained?+
Yes, Shirono 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 Shirono Lighthouse?+
Shirono 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 Shirono Lighthouse?+
You can track vessels near Shirono 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.