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Apra Inner Harbor Range Rear Lighthouse

Fl White 5s🇺🇸USOperational

Location & Light Range

About Apra Inner Harbor Range Rear Lighthouse

This square concrete post, standing 9 meters high, serves as the rear marker for a navigational range within Apra Inner Harbor. It is painted red with a white vertical stripe and carries a rectangular daymark. The light emits a white flash every 5 seconds from a focal height of 69 meters, offering a geographic range of 21.3 nautical miles. Located on the south side of the U.S. Navy base, it marks the rear alignment for vessels entering or departing the harbor. While the site is open, the tower itself is closed to the public. The nearest port is Apra, approximately 1.4 kilometers away.

Why it matters: This range rear light is indispensable for safe navigation within Apra Inner Harbor, a critical U.S. Navy port. It provides essential alignment for vessels traversing the harbor's channels.

Light & Optic

Characteristic Signature
Fl White 5s
Flash Type
Flashing
Light Color
White
Interval
5s
Raw Code
Fl W 5s
Focal Height
69m
Geographic Range
21.3NM

Location

Country
🇺🇸United States
Region
Guam
Sea Region
Apra Inner Harbor, within the U.S. Navy base on the south side of the harbor, marking the rear of a range.
Latitude
13.4461°
Longitude
144.6197°

References & Identifiers

Nearest Port
Apra(1.4 km)
Admiralty No.
M8388.1
NGA No.
10986.1
USCG No.
6-30805
ARLHS No.
GUM-001

Tower & Structure

Tower Height
9m
Tower Shape
square
Tower Color
red with a white vertical stripe
Material
concrete

Structure: A 9m square concrete post carrying a rectangular daymark, painted red with a white vertical stripe.

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Apra Inner Harbor Range Rear Lighthouse at night?+
Apra Inner Harbor Range Rear displays the characteristic Fl White 5s. 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 color may indicate a specific sector or warning zone.
Which ports and harbors does Apra Inner Harbor Range Rear Lighthouse guide vessels into?+
Apra Inner Harbor Range Rear Lighthouse assists vessels approaching 3 nearby ports. The closest is Apra (Agana) at 0.3 NM to the NW. Other ports served include Guam (1.9 NM E), Barrigada (9.6 NM E). Mariners should consult the relevant chart for full approach and pilotage information.
Is Apra Inner Harbor Range Rear Lighthouse still active and maintained?+
Yes, Apra Inner 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 Inner Harbor Range Rear Lighthouse?+
You can track vessels near Apra Inner 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.