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
KOYO MARU
Cargo · Japan · last seen 35°N 135°E · Jun 2026 · MMSI 431401953 · Call sign JI3710
Not yet on Master's MateType
Cargo
Flag
JPNLength
125 m
Beam
20 m
Draft
6 m
Call sign
JI3710
IMO
9279604
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
8
KOYO MARU is a Japanese ocean freighter, 125 metres LOA. Below, she has a beam measuring 20 metres and a draft of 6 m. On AIS she shows as MMSI 431401953, call sign JI3710, IMO 9279604. There's a place for KOYO MARU on the Master's Mate Safety Initiative Network — free, community-driven, like AAA for the ocean.
Free forever · No credit card · for commercial operators
Eyes on KOYO 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 13:41 UTC
Position
34.5825° N, 135.4270° E
Status
Under way (engine)
Speed
0.0 kn
Course
160°
Destination
>JP SBK 3 MAZDA
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.
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 KOYO 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 KOYO MARU and switch it all on
Free to join · nothing to install to start · cancel anytime
About KOYO MARU
What kind of vessel is KOYO MARU?
KOYO MARU is a Cargo flagged to Japan.
Where was KOYO MARU last seen?
KOYO MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is KOYO MARU's MMSI?
KOYO MARU's MMSI is 431401953. Call sign JI3710. IMO 9279604.
How big is KOYO MARU?
KOYO MARU is about 125 m long, 20 m on the beam, drawing 6 m.
Is KOYO MARU on the Master's Mate Safety Initiative Network?
Not yet. If KOYO 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.