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Nosy Alagnagna Lighthouse

Fl (3) W 25s🇲🇬Madagascar, MGOperational

Location & Light Range

About Nosy Alagnagna Lighthouse

This white octagonal masonry tower stands 60 meters tall. It features black banding along its height and a black cupola capping the structure. The light source is situated at a focal height of 60 meters. This lighthouse emits a white light. Its characteristic is a single white flash. The lighthouse has a published geographic range of 23 nautical miles.

Light & Optic

Characteristic Signature
Fl (3) W 25s
Flash Type
Flashing
Light Color
White
Flash Count
3 flashes
Interval
25s
Raw Code
Fl
Focal Height
60m
Geographic Range
23NM

Location

City
Madagascar
Country
🇲🇬MG
Latitude
-18.0487°
Longitude
49.4599°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
60m
Tower Shape
octagonal
Tower Color
white
Material
masonry

Structure: White octagonal masonry tower, black banded, black cupola; 197

References & Identifiers

Admiralty No.
D6972
NGA No.
32460
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Frequently Asked Questions

How do mariners identify Nosy Alagnagna Lighthouse at night?+
Nosy Alagnagna displays the characteristic Fl (3) W 25s — 3 white flashes every 25 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 Nosy Alagnagna Lighthouse guide vessels into?+
Nosy Alagnagna Lighthouse assists vessels approaching 2 nearby ports. The closest is Toamasina at 6.7 NM to the SSW. Other ports served include Tamatave (Toamasina) (7.5 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Nosy Alagnagna Lighthouse still active and maintained?+
Yes, Nosy Alagnagna 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 Nosy Alagnagna Lighthouse?+
You can track vessels near Nosy Alagnagna 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.