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Kalholmen Lighthouse

Oc (2) White/Red/Green 8s🇳🇴Frøya, NOOperational

Location & Light Range

About Kalholmen Lighthouse

This square skeletal tower, standing 10 meters tall, is located on the north point of Kalholmen island, approximately 1.8 km west of Sula in the Frøya municipality. Its upper section is enclosed with siding, topped by a lantern and gallery. The lighthouse emits an occulting white, red, or green light, with two flashes every 8 seconds, indicating the direction of safe passage. Its focal height reaches 17 meters, providing a geographic range of 12.4 nautical miles. The site is accessible to the public, although the tower itself remains closed. Kalholmen lighthouse was removed from the Admiralty list in March 2022 but is still maintained.

Why it matters: Its directional light provides precise guidance for vessels navigating the channels and approaches west of Sula.

Light & Optic

Characteristic Signature
Oc (2) White/Red/Green 8s
Flash Type
Occulting
Light Color
White/Red/Green
Flash Count
2 flashes
Interval
8s
Raw Code
Oc(2) WRG 8s
Focal Height
17m
Geographic Range
12.4NM

Construction & History

Significant events: Dropped from Admiralty list in March 2022

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
10m
Tower Shape
square
Tower Color
White with a red lantern roof

Structure: square skeletal tower, the upper portion enclosed by siding, with lantern and gallery

Location

City
Frøya
Country
🇳🇴Norway
Region
Trøndelag
Sea Region
North point of Kalholmen island, approximately 1.8 km west of Sula
Latitude
63.8498°
Longitude
8.4224°

References & Identifiers

Nearest Port
Nordskaget(9.2 km)
Admiralty No.
L1508
NGA No.
8044
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Frequently Asked Questions

How do mariners identify Kalholmen Lighthouse at night?+
Kalholmen displays the characteristic Oc (2) White/Red/Green 8s — 2 white/red/green flashes every 8 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. The white/red/green color may indicate a specific sector or warning zone.
Which ports and harbors does Kalholmen Lighthouse guide vessels into?+
Kalholmen Lighthouse assists vessels approaching 5 nearby ports. The closest is Sula at 1.1 NM to the ESE. Other ports served include Mausund (6.5 NM E), Stranda - Frøya (7.5 NM ESE), Nordskaget - Frøya (9.2 NM SSE), Dyrvik (12 NM ESE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Kalholmen Lighthouse still active and maintained?+
Yes, Kalholmen 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 Kalholmen Lighthouse?+
You can track vessels near Kalholmen 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.