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
KOUSHINMARU
Tanker · last seen 35°N 135°E · Jun 2026 · MMSI 431005815 · Call sign JD3754
Not yet on Master's MateType
Tanker
Length
75 m
Beam
11 m
Draft
4.2 m
Call sign
JD3754
IMO
9724128
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
6
KOUSHINMARU is a 75-metre tanker. Her hull carries a 11-metre beam and a draft measuring 4.2 metres. She's listed under MMSI 431005815, call sign JD3754, IMO 9724128. Big or small, every hull benefits from the free Master's Mate Safety Initiative Network — KOUSHINMARU included.
Free forever · No credit card · for commercial operators
Eyes on KOUSHINMARU, 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 12:50 UTC
Position
34.6672° N, 135.1865° E
Status
Moored
Speed
0.1 kn
Course
131°
Destination
JP UKB K
ETA
06-15 14:30 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.
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The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put KOUSHINMARU 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 KOUSHINMARU and switch it all on
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About KOUSHINMARU
What kind of vessel is KOUSHINMARU?
KOUSHINMARU is a Tanker.
Where was KOUSHINMARU last seen?
KOUSHINMARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is KOUSHINMARU's MMSI?
KOUSHINMARU's MMSI is 431005815. Call sign JD3754. IMO 9724128.
How big is KOUSHINMARU?
KOUSHINMARU is about 75 m long, 11 m on the beam, drawing 4.2 m.
Is KOUSHINMARU on the Master's Mate Safety Initiative Network?
Not yet. If KOUSHINMARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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