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
SHIUN MARU
MMSI 431016602 · Call sign JD4927
Not yet on Master's MateType
Cargo
Flag
JPNLength
76 m
Beam
13 m
Draft
4.3 m
Call sign
JD4927
IMO
9927029
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
85
SHIUN MARU, a Japanese freighter, measures 76 metres on deck. She has a 13 m beam and a draft of 4.3 m. On AIS she shows as MMSI 431016602, call sign JD4927, IMO 9927029. SHIUN MARU belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.
Free forever · No credit card · for commercial operators
Eyes on SHIUN 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
39.7720° N, 140.0499° E
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 SHIUN 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 SHIUN MARU and switch it all on
Free to join · nothing to install to start · cancel anytime
About SHIUN MARU
What kind of vessel is SHIUN MARU?
SHIUN MARU is a Cargo flagged to Japan.
Where was SHIUN MARU last seen?
SHIUN MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is SHIUN MARU's MMSI?
SHIUN MARU's MMSI is 431016602. Call sign JD4927. IMO 9927029.
How big is SHIUN MARU?
SHIUN MARU is about 76 m long, 13 m on the beam, drawing 4.3 m.
Is SHIUN MARU on the Master's Mate Safety Initiative Network?
Not yet. If SHIUN MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.