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
KOYO MARU NO.21
Tanker · last seen 33°N 135°E · Jun 2026 · MMSI 431018367 · Call sign JD5008
Not yet on Master's MateType
Tanker
Length
105 m
Beam
16 m
Draft
5.3 m
Call sign
JD5008
IMO
9926374
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
12
KOYO MARU NO.21 is a 105-metre tanker. Below, she has a beam measuring 16 metres and a draft of 5.3 m. Her papers read MMSI 431018367, call sign JD5008, IMO 9926374. It's free to add KOYO MARU NO.21 to the Master's Mate Safety Initiative Network — like AAA for the ocean, run by the cruisers who use it.
Free forever · No credit card · for commercial operators
Eyes on KOYO MARU NO.21, 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 16, 2026 00:35 UTC
Position
33.3744° N, 134.8525° E
Status
Under way (engine)
Speed
14.2 kn
Course
69°
Destination
>JP YKK OFF
ETA
06-16 23:00 UTC
Wherever KOYO MARU NO.21 roams, 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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Joining the Safety Initiative Network doesn't just put KOYO MARU NO.21 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 NO.21 and switch it all on
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About KOYO MARU NO.21
What kind of vessel is KOYO MARU NO.21?
KOYO MARU NO.21 is a Tanker.
Where was KOYO MARU NO.21 last seen?
KOYO MARU NO.21 was last reported in around 33°N 135°E in Jun 2026 on public AIS.
What is KOYO MARU NO.21's MMSI?
KOYO MARU NO.21's MMSI is 431018367. Call sign JD5008. IMO 9926374.
How big is KOYO MARU NO.21?
KOYO MARU NO.21 is about 105 m long, 16 m on the beam, drawing 5.3 m.
Is KOYO MARU NO.21 on the Master's Mate Safety Initiative Network?
Not yet. If KOYO MARU NO.21 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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