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
SHOYO MARU
MMSI 431003521 · Call sign JD3356
Not yet on Master's MateType
Tanker
Flag
JPNLength
105 m
Beam
16 m
Draft
5.2 m
Call sign
JD3356
IMO
9629275
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
87
SHOYO MARU is a tank ship on the Japan registry, 105 metres overall. She carries a beam measuring 16 metres and a 5.2-metre draft. Her registration reads MMSI 431003521, call sign JD3356, IMO 9629275. Join SHOYO MARU to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.
Free forever · No credit card · for commercial operators
Eyes on SHOYO 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
39.8740° N, 139.8532° E
Transiting the Sea of Japan? You're never out there alone.
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Joining the Safety Initiative Network doesn't just put SHOYO 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 SHOYO MARU and switch it all on
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About SHOYO MARU
What kind of vessel is SHOYO MARU?
SHOYO MARU is a Tanker flagged to Japan.
Where was SHOYO MARU last seen?
SHOYO MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is SHOYO MARU's MMSI?
SHOYO MARU's MMSI is 431003521. Call sign JD3356. IMO 9629275.
How big is SHOYO MARU?
SHOYO MARU is about 105 m long, 16 m on the beam, drawing 5.2 m.
Is SHOYO MARU on the Master's Mate Safety Initiative Network?
Not yet. If SHOYO MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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