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.
Tug
AIZU MARU
MMSI 431017289 · Call sign JD4966
Not yet on Master's MateType
Tug
Flag
JPNLength
32 m
Beam
11 m
Draft
4.4 m
Call sign
JD4966
IMO
9931939
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
51
AIZU MARU is a tug on the Japan registry, 32 metres on deck. Below, she has a beam measuring 11 metres and a draft measuring 4.4 metres. On the registers she's MMSI 431017289, call sign JD4966, IMO 9931939. Put AIZU MARU on the Master's Mate Safety Initiative Network — free to claim, with a whole fleet watching out for her.
Free forever · No credit card · for working boats
Built for boats that work — like AIZU MARU.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Jun 4, 2026
Position
38.3230° N, 141.0332° E
Working the Sea of Japan? You're never out there alone.
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Joining the Safety Initiative Network doesn't just put AIZU MARU on the map. It hands you the full bridge:
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
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.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
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.
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 AIZU MARU and switch it all on
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About AIZU MARU
What kind of vessel is AIZU MARU?
AIZU MARU is a Tug flagged to Japan.
Where was AIZU MARU last seen?
AIZU MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is AIZU MARU's MMSI?
AIZU MARU's MMSI is 431017289. Call sign JD4966. IMO 9931939.
How big is AIZU MARU?
AIZU MARU is about 32 m long, 11 m on the beam, drawing 4.4 m.
Is AIZU MARU on the Master's Mate Safety Initiative Network?
Not yet. If AIZU MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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