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.
Tug
5 DONG SUNG
MMSI 440133310 · Call sign 886531
Not yet on Master's MateType
Tug
Flag
KORLength
20 m
Beam
4 m
Draft
2 m
Call sign
886531
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
49
5 DONG SUNG is a harbour tug hailing from South Korea, 20 metres LOA. Her hull carries 4 metres in the beam and a draft of 2 m. She's on record as MMSI 440133310, call sign 886531. The Master's Mate Safety Initiative Network welcomes 5 DONG SUNG — free to join, cruiser-run, and always on watch.
Free forever · No credit card · for working boats
Built for boats that work — like 5 DONG SUNG.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Jun 4, 2026
Position
35.0445° N, 129.0184° E
Working 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.
Free with your claim · for working boats
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put 5 DONG SUNG on the map. It hands you the full bridge:
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
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.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim 5 DONG SUNG and switch it all on
Free to join · nothing to install to start · cancel anytime
About 5 DONG SUNG
What kind of vessel is 5 DONG SUNG?
5 DONG SUNG is a Tug flagged to South Korea.
Where was 5 DONG SUNG last seen?
5 DONG SUNG was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is 5 DONG SUNG's MMSI?
5 DONG SUNG's MMSI is 440133310. Call sign 886531.
How big is 5 DONG SUNG?
5 DONG SUNG is about 20 m long, 4 m on the beam, drawing 2 m.
Is 5 DONG SUNG on the Master's Mate Safety Initiative Network?
Not yet. If 5 DONG SUNG 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.