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
KAKUYOU MARU
MMSI 431019191 · Call sign JD5103
Not yet on Master's MateType
Tanker
Flag
JPNLength
104 m
Beam
16 m
Draft
5 m
Call sign
JD5103
IMO
9940021
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
62
A Japanese tanker, KAKUYOU MARU measures 104 metres. Below, she has a beam measuring 16 metres and a draft measuring 5 metres. On AIS she shows as MMSI 431019191, call sign JD5103, IMO 9940021. KAKUYOU 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 KAKUYOU 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
35.5412° N, 139.8843° 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 KAKUYOU 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 KAKUYOU MARU and switch it all on
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About KAKUYOU MARU
What kind of vessel is KAKUYOU MARU?
KAKUYOU MARU is a Tanker flagged to Japan.
Where was KAKUYOU MARU last seen?
KAKUYOU MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is KAKUYOU MARU's MMSI?
KAKUYOU MARU's MMSI is 431019191. Call sign JD5103. IMO 9940021.
How big is KAKUYOU MARU?
KAKUYOU MARU is about 104 m long, 16 m on the beam, drawing 5 m.
Is KAKUYOU MARU on the Master's Mate Safety Initiative Network?
Not yet. If KAKUYOU MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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