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.
Anti-pollution
SEA CLEANER 4
MMSI 477997121
Not yet on Master's MateType
Anti-pollution
Flag
HKGLength
27 m
Beam
10 m
Draft
1 m
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
43
SEA CLEANER 4, a craft flying the flag of Hong Kong, measures 27 metres on deck. SEA CLEANER 4 has a beam measuring 10 metres and a 1-metre draft. Her papers read MMSI 477997121. SEA CLEANER 4 is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.
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Is SEA CLEANER 4 your boat?
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
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Last known position · Jun 4, 2026
Position
22.3106° N, 114.1593° E
Crossing the South China Sea? 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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The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put SEA CLEANER 4 on the map. It hands you the full bridge:
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.
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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
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.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim SEA CLEANER 4 and switch it all on
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About SEA CLEANER 4
What kind of vessel is SEA CLEANER 4?
SEA CLEANER 4 is a Anti-pollution flagged to Hong Kong S.A.R..
Where was SEA CLEANER 4 last seen?
SEA CLEANER 4 was last reported in the South China Sea in Jun 2026 on public AIS.
What is SEA CLEANER 4's MMSI?
SEA CLEANER 4's MMSI is 477997121.
How big is SEA CLEANER 4?
SEA CLEANER 4 is about 27 m long, 10 m on the beam, drawing 1 m.
Is SEA CLEANER 4 on the Master's Mate Safety Initiative Network?
Not yet. If SEA CLEANER 4 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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