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
2021YUSUNG
MMSI 440067880 · Call sign SSD
Not yet on Master's MateFlag
KORLength
27 m
Beam
7 m
Call sign
SSD
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
85
A South Korean boat, 2021YUSUNG measures 27 metres. Her hull carries a beam measuring 7 metres. On AIS she shows as MMSI 440067880, call sign SSD. Bring 2021YUSUNG aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.
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Is 2021YUSUNG 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
Live AIS position · Jun 9, 2026 03:56 UTC
Position
35.1541° N, 129.5292° E
Speed
8.3 kn
Course
93°
Crossing the Sea of Japan? 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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Joining the Safety Initiative Network doesn't just put 2021YUSUNG 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 2021YUSUNG and switch it all on
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About 2021YUSUNG
What kind of vessel is 2021YUSUNG?
2021YUSUNG is a vessel flagged to South Korea.
Where was 2021YUSUNG last seen?
2021YUSUNG was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is 2021YUSUNG's MMSI?
2021YUSUNG's MMSI is 440067880. Call sign SSD.
How big is 2021YUSUNG?
2021YUSUNG is about 27 m long, 7 m on the beam.
Is 2021YUSUNG on the Master's Mate Safety Initiative Network?
Not yet. If 2021YUSUNG is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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