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.
Vessel
Choukai Maru
MMSI 431001715
Not yet on Master's MateFlag
JPNLength
70 m
IMO
9580302
AIS reports
2
Registered in Japan, Choukai Maru is a 70-metre craft. On AIS she appears as MMSI 431001715, IMO 9580302. Bring Choukai Maru aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.
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Is Choukai Maru your boat?
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Live AIS position · Jun 9, 2026 02:53 UTC
Position
39.7934° N, 139.9892° E
Status
Under way (engine)
Speed
11.7 kn
Course
283°
Destination
>JP ISM
ETA
06-10 21:00 UTC
Crossing 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
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Choukai Maru on the map. It hands you the full bridge:
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
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.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim Choukai Maru and switch it all on
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About Choukai Maru
What kind of vessel is Choukai Maru?
Choukai Maru is a vessel flagged to Japan.
Where was Choukai Maru last seen?
Choukai Maru was last reported in the Sea of Japan on public AIS.
What is Choukai Maru's MMSI?
Choukai Maru's MMSI is 431001715. IMO 9580302.
How big is Choukai Maru?
Choukai Maru is about 70 m long.
Is Choukai Maru on the Master's Mate Safety Initiative Network?
Not yet. If Choukai Maru is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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