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.
Cargo
KOYU MARU
Cargo · last seen 35°N 135°E · Jun 2026 · MMSI 431005964 · Call sign JD3785
Not yet on Master's MateType
Cargo
Length
62 m
Beam
10 m
Draft
3 m
Call sign
JD3785
IMO
9712242
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
6
KOYU MARU is a 62-metre merchant ship. Below, she has a 10 m beam and a draft measuring 3 metres. Officially she's MMSI 431005964, call sign JD3785, IMO 9712242. Big or small, every hull benefits from the free Master's Mate Safety Initiative Network — KOYU MARU included.
Free forever · No credit card · for commercial operators
Eyes on KOYU 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 12:54 UTC
Position
34.7838° N, 134.6395° E
Status
Under way (engine)
Speed
0.0 kn
Course
269°
Destination
JP HIM
ETA
06-14 18:00 UTC
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 KOYU 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 KOYU MARU and switch it all on
Free to join · nothing to install to start · cancel anytime
About KOYU MARU
What kind of vessel is KOYU MARU?
KOYU MARU is a Cargo.
Where was KOYU MARU last seen?
KOYU MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is KOYU MARU's MMSI?
KOYU MARU's MMSI is 431005964. Call sign JD3785. IMO 9712242.
How big is KOYU MARU?
KOYU MARU is about 62 m long, 10 m on the beam, drawing 3 m.
Is KOYU MARU on the Master's Mate Safety Initiative Network?
Not yet. If KOYU MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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