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Gryten Lighthouse

Fl (4) White/Red/Green 10s🇸🇪Norrtälje kommun, SEOperational

Location & Light Range

About Gryten Lighthouse

This concrete tower, built in 1947, stands 8 meters tall with its focal height at 6 meters. It is painted white and features a green horizontal band encircling the lantern. The lighthouse emits a sequence of four flashes, alternating between white, red, and green, every ten seconds. This color change indicates the direction of approach for vessels navigating the channel north of Yxlan. While the site is open for visitors, the tower itself is not accessible to the public. The nearest port is Norrtalje, 8.9 kilometers away.

Why it matters: Gryten lighthouse is essential for navigating the channel north of Yxlan, a critical passage within the Stockholm archipelago. Its sophisticated directional light system, which shifts colors based on approach, provides precise guidance, preventing groundings and collisions in these complex, island-strewn waters.

Light & Optic

Characteristic Signature
Fl (4) White/Red/Green 10s
Flash Type
Flashing
Light Color
White/Red/Green
Flash Count
4 flashes
Interval
10s
Raw Code
Fl(4) WRG 10s
Focal Height
6m
Light Range
9NM (16.7 km)
Geographic Range
8.9NM

Construction & History

Year Built
1947

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
8m
Tower Shape
cylindrical
Tower Color
white with a green horizontal band around the lantern
Material
concrete

Structure: round cylindrical concrete tower with lantern and gallery, painted white with a green horizontal band around the lantern

Location

City
Norrtälje kommun
Country
🇸🇪Sweden
Region
Stockholm County
Sea Region
center of the channel north of Yxlan
Latitude
59.6186°
Longitude
18.8183°

References & Identifiers

Nearest Port
Norrtalje(8.9 km)
Admiralty No.
C6421
NGA No.
9648
Wikidata
Q28375393 →
OpenStreetMap
View on OSM →
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Frequently Asked Questions

How far offshore can Gryten Lighthouse be seen?+
With a focal height of 6 meters and a nominal range of 9 nautical miles (approximately 16.7 km), Gryten is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. This range makes it a significant coastal navigation aid for vessels transiting the area.
How do mariners identify Gryten Lighthouse at night?+
Gryten displays the characteristic Fl (4) White/Red/Green 10s — 4 white/red/green flashes every 10 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 Gryten Lighthouse guide vessels into?+
Gryten Lighthouse assists vessels approaching 5 nearby ports. The closest is Norrtälje at 8.5 NM to the NNW. Other ports served include Kapellskär (9.6 NM NE), Linanäs (13 NM NE), Vaxholm (19.8 NM SW), Sandhamn (20 NM S). Mariners should consult the relevant chart for full approach and pilotage information.
Is Gryten Lighthouse still active and maintained?+
Yes, Gryten 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 Gryten Lighthouse?+
Gryten 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 Gryten Lighthouse?+
You can track vessels near Gryten 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.