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
KOSHO MARU NO.3
MMSI 431000607 · Call sign JD2663
Not yet on Master's MateType
Cargo
Flag
JPNLength
73 m
Beam
12 m
Draft
4.9 m
Call sign
JD2663
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
13
KOSHO MARU NO.3 is a Japanese general cargo ship, spanning 73 metres. She has 12 metres in the beam and a draft measuring 4.9 metres. She's on record as MMSI 431000607, call sign JD2663. KOSHO MARU NO.3 is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.
Free forever · No credit card · for commercial operators
Eyes on KOSHO MARU NO.3, 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 2, 2026
Position
35.3563° N, 139.6685° 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 KOSHO MARU NO.3 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 KOSHO MARU NO.3 and switch it all on
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About KOSHO MARU NO.3
What kind of vessel is KOSHO MARU NO.3?
KOSHO MARU NO.3 is a Cargo flagged to Japan.
Where was KOSHO MARU NO.3 last seen?
KOSHO MARU NO.3 was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is KOSHO MARU NO.3's MMSI?
KOSHO MARU NO.3's MMSI is 431000607. Call sign JD2663.
How big is KOSHO MARU NO.3?
KOSHO MARU NO.3 is about 73 m long, 12 m on the beam, drawing 4.9 m.
Is KOSHO MARU NO.3 on the Master's Mate Safety Initiative Network?
Not yet. If KOSHO MARU NO.3 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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