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 631
MMSI 413489990
Not yet on Master's MateFlag
CHNLength
68.8 m
IMO
9805582
AIS reports
2
Hai Yang Shi You 631 flies the Chinese flag — a 68.8-metre vessel. Look for MMSI 413489990, IMO 9805582. Join Hai Yang Shi You 631 to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.
Free forever · No credit card
Is Hai Yang Shi You 631 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 631 roams, 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
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Hai Yang Shi You 631 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 631 and switch it all on
Free to join · nothing to install to start · cancel anytime
About Hai Yang Shi You 631
What kind of vessel is Hai Yang Shi You 631?
Hai Yang Shi You 631 is a vessel flagged to China.
What is Hai Yang Shi You 631's MMSI?
Hai Yang Shi You 631's MMSI is 413489990. IMO 9805582.
How big is Hai Yang Shi You 631?
Hai Yang Shi You 631 is about 68.8 m long.
Is Hai Yang Shi You 631 on the Master's Mate Safety Initiative Network?
Not yet. If Hai Yang Shi You 631 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.