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
503 YEON CHANG
South Korea · last seen 35°N 129°E · Jun 2026 · MMSI 440181060
Not yet on Master's MateFlag
KORFirst reported
Jun 2026
Last reported
Jun 2026
AIS reports
45
503 YEON CHANG flies the South Korean flag — a vessel. She broadcasts as MMSI 440181060. Claim 503 YEON CHANG free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.
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Is 503 YEON CHANG 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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Live AIS position · Jun 16, 2026 00:56 UTC
Position
35.0863° N, 129.0264° E
Status
Not under command
Speed
0.0 kn
Course
0°
Crossing the Sea of Japan? You're never out there alone.
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Joining the Safety Initiative Network doesn't just put 503 YEON CHANG 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 503 YEON CHANG and switch it all on
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About 503 YEON CHANG
What kind of vessel is 503 YEON CHANG?
503 YEON CHANG is a vessel flagged to South Korea.
Where was 503 YEON CHANG last seen?
503 YEON CHANG was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is 503 YEON CHANG's MMSI?
503 YEON CHANG's MMSI is 440181060.
Is 503 YEON CHANG on the Master's Mate Safety Initiative Network?
Not yet. If 503 YEON CHANG is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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