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
ULSAN 301
Tug · last seen 35°N 129°E · Jun 2026 · MMSI 440127370 · Call sign SSD
Not yet on Master's MateType
Tug
Draft
3.5 m
Call sign
SSD
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
6
ULSAN 301 is a working tug. She carries a 3.5-metre draft. Her papers read MMSI 440127370, call sign SSD. ULSAN 301 earns her keep on the water; the free Master's Mate Safety Initiative Network keeps a watching fleet and a distress mesh close at hand.
Free forever · No credit card · for working boats
Built for boats that work — like ULSAN 301.
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
Live AIS position · Jun 15, 2026 16:59 UTC
Position
35.0964° N, 129.0406° E
Status
Pushing ahead
Speed
0.0 kn
Course
0°
Destination
BUSAN
ETA
06-13 20:00 UTC
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.
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Joining the Safety Initiative Network doesn't just put ULSAN 301 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 ULSAN 301 and switch it all on
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About ULSAN 301
What kind of vessel is ULSAN 301?
ULSAN 301 is a Tug.
Where was ULSAN 301 last seen?
ULSAN 301 was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is ULSAN 301's MMSI?
ULSAN 301's MMSI is 440127370. Call sign SSD.
Is ULSAN 301 on the Master's Mate Safety Initiative Network?
Not yet. If ULSAN 301 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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