Get the MarineRadar appSatellite AISSatellite live trackingTrack any shipLive alerts112,000+ ships trackedDownload free

Apra Outer Harbor Range Rear Lighthouse

Iso Green 6s🇺🇸USOperational

Location & Light Range

About Apra Outer Harbor Range Rear Lighthouse

This steel, cylindrical skeletal tower stands 17 meters tall and is painted red with a white vertical stripe. It carries a rectangular daymark. The operational light emits a green isophase signal on a 6-second cycle, with a focal height of 20 meters. The structure is situated on a peninsula opposite the Guam Port Authority terminal on Cabras Island. The lighthouse is located 2.6 kilometers from the nearest port of Apra. Its geographic range is 13.2 nautical miles.

Why it matters: This range rear light is critical for the safe navigation of ships approaching and departing the Guam Port Authority terminal, providing precise alignment for vessels entering Apra Outer Harbor.

Light & Optic

Characteristic Signature
Iso Green 6s
Flash Type
Isophase
Light Color
Green
Interval
6s
Raw Code
Iso G 6s
Focal Height
20m
Geographic Range
13.2NM

Location

Country
🇺🇸United States
Region
Guam
Sea Region
peninsula opposite the Guam Port Authority terminal on Cabras Island
Latitude
13.4573°
Longitude
144.6720°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
17m
Tower Shape
cylindrical
Tower Color
red with a white vertical stripe
Material
steel

Structure: triangular cylindrical skeletal tower carrying a rectangular daymark painted red with a white vertical stripe

References & Identifiers

Nearest Port
Apra(2.6 km)
Admiralty No.
M8386.1
NGA No.
10983.1
USCG No.
6-30705
Live tracking · 50,000+ mariners

Find Apra Outer Harbor Range Rear Lighthouse on the live nautical map

Plan voyages near United States, see nearby vessels in real time, and explore 14,900+ navigation aids in the app.

Nautical mapNearby vesselsVoyage planning
Get the App

Frequently Asked Questions

How do mariners identify Apra Outer Harbor Range Rear Lighthouse at night?+
Apra Outer Harbor Range Rear displays the characteristic Iso Green 6s. 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Apra Outer Harbor Range Rear Lighthouse guide vessels into?+
Apra Outer Harbor Range Rear Lighthouse assists vessels approaching 4 nearby ports. The closest is Guam at 1.4 NM to the WSW. Other ports served include Apra (Agana) (3.3 NM W), Barrigada (6.5 NM E), ROTA (48.9 NM NNE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Apra Outer Harbor Range Rear Lighthouse still active and maintained?+
Yes, Apra Outer Harbor Range Rear 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 Apra Outer Harbor Range Rear Lighthouse?+
You can track vessels near Apra Outer Harbor Range Rear 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.