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Semarang Lighthouse

Fl W 20s🇮🇩Java and Madura, IDOperational

Location & Light Range

About Semarang Lighthouse

The Semarang lighthouse is a white metal tower reaching 98 meters in height. Its light produces four white flashes in a 20-second cycle. The focal height of the illumination is 33 meters above sea level. This structure guides mariners through waters near Java and Madura.

Light & Optic

Characteristic Signature
Fl W 20s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
20s
Raw Code
Fl.(4)W. period 20s
Focal Height
33m
Geographic Range
22NM

Location

City
Java and Madura
Country
🇮🇩ID
Latitude
-6.9524°
Longitude
110.4185°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
98m
Tower Color
white
Material
metal

Structure: White metal tower; 98. KEPULAUAN KARIMUNJAWA: INDONESIA (JAWA-ADJACENT ISLANDS)

References & Identifiers

Admiralty No.
Q1132
NGA No.
23560
Wikidata
Q28374902 →
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Frequently Asked Questions

How do mariners identify Semarang Lighthouse at night?+
Semarang displays the characteristic Fl W 20s — 1 white flash every 20 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 Semarang Lighthouse guide vessels into?+
Semarang Lighthouse assists vessels approaching 3 nearby ports. The closest is Semarang at 0.3 NM to the N. Other ports served include Jepara (25.6 NM NNE), Pekalongan, Java (43.3 NM W). Mariners should consult the relevant chart for full approach and pilotage information.
Is Semarang Lighthouse still active and maintained?+
Yes, Semarang 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 Semarang Lighthouse?+
You can track vessels near Semarang 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.