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Daimaru Iso Lighthouse

Fl W 3s🇯🇵Western Hokkaidō, JPOperational

Location & Light Range

About Daimaru Iso Lighthouse

This lighthouse stands on a rock just off the coast in heavy surf. The white, cylindrical concrete tower measures 11 meters in focal height. Its light displays two white flashes every 20 seconds. The structure includes a lantern and gallery. This facility is operational and has a geographic range of 16 nautical miles.

Light & Optic

Characteristic Signature
Fl W 3s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
3s
Raw Code
Fl.(2)W. period 20s
Focal Height
11m
Geographic Range
16NM

Location

City
Western Hokkaidō
Country
🇯🇵JP
Latitude
42.8069°
Longitude
140.2244°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Shape
cylindrical
Tower Color
white
Material
concrete

References & Identifiers

Admiralty No.
M7011
NGA No.
1140
ARLHS No.
JPN-2628
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Frequently Asked Questions

How do mariners identify Daimaru Iso Lighthouse at night?+
Daimaru Iso 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 Daimaru Iso Lighthouse guide vessels into?+
Daimaru Iso Lighthouse assists vessels approaching 5 nearby ports. The closest is Suttsu at 0.6 NM to the SE. Other ports served include Iwanai (17 NM NE), Youra (25.5 NM ESE), Setana (27.3 NM SW), Furubira (33.4 NM NNE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Daimaru Iso Lighthouse still active and maintained?+
Yes, Daimaru Iso 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.
How can I track vessels near Daimaru Iso Lighthouse?+
You can track vessels near Daimaru Iso 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.