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

Iso Saki Lighthouse

Fl W 12s🇯🇵Eastern Honshū (Ibaraki and Chiba), JPInactive

Location & Light Range

About Iso Saki Lighthouse

This white, cylindrical lighthouse stands 49 meters tall, with its focal plane at 36 meters above sea level. The light characteristic is a single white flash occurring every 12 seconds. Its visibility spans from 198 degrees to 358 degrees. The structure is situated on Eastern Honshū, along the coasts of Ibaraki and Chiba prefectures. The lighthouse is not currently operational.

Light & Optic

Characteristic Signature
Fl W 12s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
12s
Raw Code
Fl.W. period 12s
Focal Height
36m
Light Range
17NM (31.5 km)
Geographic Range
17NM

Location

City
Eastern Honshū (Ibaraki and Chiba)
Country
🇯🇵JP
Latitude
36.3808°
Longitude
140.6257°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
49m
Tower Shape
cylindrical
Tower Color
white

Structure: White tower; 49. Visible 198°-358°

References & Identifiers

Admiralty No.
M6495.5
NGA No.
4704
Live tracking · 50,000+ mariners

Find Iso Saki Lighthouse on the live nautical map

Plan voyages near JP, 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 far offshore can Iso Saki Lighthouse be seen?+
With a focal height of 36 meters and a nominal range of 17 nautical miles (approximately 31.5 km), Iso Saki is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. Lights of this range are typically used as landfall lights by vessels approaching from the open sea.
How do mariners identify Iso Saki Lighthouse at night?+
Iso Saki displays the characteristic Fl W 12s — 1 white flash every 12 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 Iso Saki Lighthouse guide vessels into?+
Iso Saki Lighthouse assists vessels approaching 5 nearby ports. The closest is Hitachinaka at 2.5 NM to the N. Other ports served include Nakaminato (2.8 NM SSW), Oarai (5 NM SSW), Hitachi (6.5 NM N), Kawarago (7.2 NM N). Mariners should consult the relevant chart for full approach and pilotage information.
Is Iso Saki Lighthouse still active and maintained?+
Iso Saki Lighthouse is currently listed as inactive. It may have been decommissioned, replaced by a different navigation aid, or temporarily taken out of service. Mariners should check the latest Notices to Mariners for current status.
What shipping routes pass near Iso Saki Lighthouse?+
Iso Saki Lighthouse is located within the Japan / Korea shipping lane — a busy shipping corridor linking the major ports of Japan and South Korea. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Iso Saki Lighthouse?+
You can track vessels near Iso Saki 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.