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Digerud Søndre Lighthouse

Oc White/Red/Green 4s🇳🇴Frogn, NOOperational

Location & Light Range

About Digerud Søndre Lighthouse

Established in 2009, the Digerud Søndre lighthouse is an 8-meter octagonal fiberglass tower mounted on a pile-supported platform. It is located about 150 meters northwest of the former Digerudgrunnen lighthouse site in Frogn, Norway. The tower displays white with two narrow black horizontal bands and a red top. It emits an occulting white, red, or green light that changes every 4 seconds, with a geographic range of 9.7 nautical miles. The station was established in 2009, with the site open to the public but the tower closed.

Why it matters: This lighthouse warns mariners about the Digerudgrunnen, likely an underwater hazard, and its directional light provides precise guidance.

Light & Optic

Characteristic Signature
Oc White/Red/Green 4s
Flash Type
Occulting
Light Color
White/Red/Green
Interval
4s
Raw Code
Oc WRG 4s
Focal Height
8m
Geographic Range
9.7NM

Construction & History

Year Built
2009

Significant events: station established 2009

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
8m
Tower Shape
octagonal
Tower Color
white with two narrow black horizontal bands and a red top
Material
fiberglass

Structure: octagonal fiberglass tower mounted on a small platform supported by piles

Location

City
Frogn
Country
🇳🇴Norway
Region
Akershus
Sea Region
Located about 150 m northwest of the site of the Digerudgrunnen lighthouse in Norway.
Latitude
59.7195°
Longitude
10.5877°

References & Identifiers

Nearest Port
Fagerstrand(0.8 km)
Admiralty No.
B2378
NGA No.
0417
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Frequently Asked Questions

How do mariners identify Digerud Søndre Lighthouse at night?+
Digerud Søndre displays the characteristic Oc White/Red/Green 4s. 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. The white/red/green color may indicate a specific sector or warning zone.
Which ports and harbors does Digerud Søndre Lighthouse guide vessels into?+
Digerud Søndre Lighthouse assists vessels approaching 5 nearby ports. The closest is Engene at 2.7 NM to the SSW. Other ports served include Drøbak (3.7 NM SSE), GRAFFSTRANDA (3.9 NM NW), Bjørkås (4.7 NM NW), Slemmestad (4.7 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Digerud Søndre Lighthouse still active and maintained?+
Yes, Digerud Søndre 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 Digerud Søndre Lighthouse?+
Digerud Søndre Lighthouse is located within the Baltic Sea trade route — a vital shipping corridor for trade between Scandinavian, German, Polish, and Baltic state ports. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Digerud Søndre Lighthouse?+
You can track vessels near Digerud Søndre 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.