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.

Vessel

Seal Island

MMSI 477521600

Not yet on Master's Mate

Flag

HKG

Length

176.5 m

IMO

9736406

AIS reports

Seal Island is a Hong Kong boat, 176.5 metres LOA. Officially she's MMSI 477521600, IMO 9736406. Seal Island belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.

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Is Seal Island 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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Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers

Wherever Seal Island 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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The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put Seal Island 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 Seal Island and switch it all on

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About Seal Island

What kind of vessel is Seal Island?

Seal Island is a vessel flagged to Hong Kong S.A.R..

What is Seal Island's MMSI?

Seal Island's MMSI is 477521600. IMO 9736406.

How big is Seal Island?

Seal Island is about 176.5 m long.

Is Seal Island on the Master's Mate Safety Initiative Network?

Not yet. If Seal Island is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).