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
Hai Yang Shi You 721
MMSI 413304540
Not yet on Master's MateFlag
CHNLength
107.4 m
IMO
9714525
AIS reports
2
Hai Yang Shi You 721 is a Chinese craft — 107.4 metres overall. Look for MMSI 413304540, IMO 9714525. Join Hai Yang Shi You 721 to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.
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Is Hai Yang Shi You 721 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.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Hai Yang Shi You 721 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 Hai Yang Shi You 721 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 Hai Yang Shi You 721 and switch it all on
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About Hai Yang Shi You 721
What kind of vessel is Hai Yang Shi You 721?
Hai Yang Shi You 721 is a vessel flagged to China.
What is Hai Yang Shi You 721's MMSI?
Hai Yang Shi You 721's MMSI is 413304540. IMO 9714525.
How big is Hai Yang Shi You 721?
Hai Yang Shi You 721 is about 107.4 m long.
Is Hai Yang Shi You 721 on the Master's Mate Safety Initiative Network?
Not yet. If Hai Yang Shi You 721 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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