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
KEIYO MARU
MMSI 431000275 · Call sign JD2489
Not yet on Master's MateType
Tanker
Flag
JPNLength
90 m
Beam
14 m
Draft
4.6 m
Call sign
JD2489
IMO
9426544
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
11
On the Japanese registry, KEIYO MARU is a 90-metre tank ship. KEIYO MARU has a beam of 14 m and a 4.6 m draft. Her papers read MMSI 431000275, call sign JD2489, IMO 9426544. KEIYO MARU can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.
Free forever · No credit card · for commercial operators
Eyes on KEIYO 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
Last known position · Jun 4, 2026
Position
35.5209° N, 139.7664° E
Transiting the Sea of Japan? You're never out there alone.
Thousands of cruisers on the Master's Mate Network — ready to help the moment something goes wrong.
Free with your claim · for commercial operators
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put KEIYO 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 KEIYO MARU and switch it all on
Free to join · nothing to install to start · cancel anytime
About KEIYO MARU
What kind of vessel is KEIYO MARU?
KEIYO MARU is a Tanker flagged to Japan.
Where was KEIYO MARU last seen?
KEIYO MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is KEIYO MARU's MMSI?
KEIYO MARU's MMSI is 431000275. Call sign JD2489. IMO 9426544.
How big is KEIYO MARU?
KEIYO MARU is about 90 m long, 14 m on the beam, drawing 4.6 m.
Is KEIYO MARU on the Master's Mate Safety Initiative Network?
Not yet. If KEIYO MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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