Master's MateSafety Initiative Network
The Master's Mate Safety Initiative Network (MMSIn) — like AAA for the ocean, but free & community-driven. Cruisers keeping each other safe: anchor-drag & distress alerts, a verified captains directory, and a watch network that has your back.
Tanker
YUUKOU MARU
Tanker · Japan · last seen 35°N 135°E · Jun 2026 · MMSI 431401844 · Call sign JK5538
Not yet on Master's MateType
Tanker
Flag
JPNLength
59 m
Beam
10 m
Draft
4 m
Call sign
JK5538
IMO
9235220
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
13
Registered in Japan, YUUKOU MARU is a 59-metre tank vessel. Her hull carries a beam measuring 10 metres and a draft of 4 m. Her registration reads MMSI 431401844, call sign JK5538, IMO 9235220. Bring YUUKOU MARU aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.
Free forever · No credit card · for commercial operators
Eyes on YUUKOU MARU, around the clock.
Real-time AIS, full systems telemetry, distress alerting and worldwide charts — your hull on one dashboard, from anywhere.
Put her on the dashboard — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Live AIS position · Jun 15, 2026 13:11 UTC
Position
34.7113° N, 134.7954° E
Status
At anchor
Speed
0.1 kn
Course
254°
Destination
>JP HHR
ETA
06-16 08:20 UTC
Transiting the Sea of Japan? You're never out there alone.
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Joining the Safety Initiative Network doesn't just put YUUKOU MARU on the map. It hands you the full bridge:
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim YUUKOU MARU and switch it all on
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About YUUKOU MARU
What kind of vessel is YUUKOU MARU?
YUUKOU MARU is a Tanker flagged to Japan.
Where was YUUKOU MARU last seen?
YUUKOU MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is YUUKOU MARU's MMSI?
YUUKOU MARU's MMSI is 431401844. Call sign JK5538. IMO 9235220.
How big is YUUKOU MARU?
YUUKOU MARU is about 59 m long, 10 m on the beam, drawing 4 m.
Is YUUKOU MARU on the Master's Mate Safety Initiative Network?
Not yet. If YUUKOU MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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