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.
Tug
KAIYU
MMSI 432506000 · Call sign 7JAQ
Not yet on Master's MateType
Tug
Flag
JPNDraft
5.2 m
Call sign
7JAQ
IMO
9344576
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
14
KAIYU flies the Japanese flag — a harbour tug. Her hull carries a draft of 5.2 m. Her papers read MMSI 432506000, call sign 7JAQ, IMO 9344576. Add KAIYU to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.
Free forever · No credit card · for working boats
Built for boats that work — like KAIYU.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Jun 2, 2026
Position
35.3322° N, 139.6754° E
Working 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 working boats
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put KAIYU on the map. It hands you the full bridge:
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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 KAIYU and switch it all on
Free to join · nothing to install to start · cancel anytime
About KAIYU
What kind of vessel is KAIYU?
KAIYU is a Tug flagged to Japan.
Where was KAIYU last seen?
KAIYU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is KAIYU's MMSI?
KAIYU's MMSI is 432506000. Call sign 7JAQ. IMO 9344576.
Is KAIYU on the Master's Mate Safety Initiative Network?
Not yet. If KAIYU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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