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

Great Spring

MMSI 477021800

Not yet on Master's Mate

Flag

HKG

Length

199.9 m

IMO

9797008

AIS reports

Great Spring, a vessel flagged in Hong Kong, measures 199.9 metres on deck. On the registers she's MMSI 477021800, IMO 9797008. Claim Great Spring free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.

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Is Great Spring 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 Great Spring 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 Great Spring 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 Great Spring and switch it all on

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About Great Spring

What kind of vessel is Great Spring?

Great Spring is a vessel flagged to Hong Kong S.A.R..

What is Great Spring's MMSI?

Great Spring's MMSI is 477021800. IMO 9797008.

How big is Great Spring?

Great Spring is about 199.9 m long.

Is Great Spring on the Master's Mate Safety Initiative Network?

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