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.
Tanker
DONGSOO1
MMSI 440321070 · Call sign SSD
Not yet on Master's MateType
Tanker
Flag
KORLength
92 m
Beam
13 m
Draft
4.7 m
Call sign
SSD
IMO
9384643
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
85
DONGSOO1 is a South Korean 92-metre tank ship. She carries 13 metres in the beam and a 4.7 m draft. Find her under MMSI 440321070, call sign SSD, IMO 9384643. DONGSOO1 is welcome on the Master's Mate Safety Initiative Network — a free, community-run watch where boats look out for one another.
Free forever · No credit card · for commercial operators
Eyes on DONGSOO1, around the clock.
Real-time AIS, full systems telemetry, distress alerting and worldwide charts — your hull on one dashboard, from anywhere.
Put her on the dashboard — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Jun 4, 2026
Position
35.0511° N, 129.0009° E
Transiting 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 DONGSOO1 on the map. It hands you the full bridge:
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
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.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
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 DONGSOO1 and switch it all on
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About DONGSOO1
What kind of vessel is DONGSOO1?
DONGSOO1 is a Tanker flagged to South Korea.
Where was DONGSOO1 last seen?
DONGSOO1 was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is DONGSOO1's MMSI?
DONGSOO1's MMSI is 440321070. Call sign SSD. IMO 9384643.
How big is DONGSOO1?
DONGSOO1 is about 92 m long, 13 m on the beam, drawing 4.7 m.
Is DONGSOO1 on the Master's Mate Safety Initiative Network?
Not yet. If DONGSOO1 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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