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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
HYOPSUNG NO.31
MMSI 440324360 · Call sign SSD
Not yet on Master's MateType
Tug
Flag
KORLength
33 m
Beam
10 m
Draft
1.3 m
Call sign
SSD
IMO
9909974
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
85
HYOPSUNG NO.31 is a South Korean 33-metre tug. She has a beam of 10 m and a draft measuring 1.3 metres. Officially she's MMSI 440324360, call sign SSD, IMO 9909974. It's free to add HYOPSUNG NO.31 to the Master's Mate Safety Initiative Network — like AAA for the ocean, run by the cruisers who use it.
Free forever · No credit card · for working boats
Built for boats that work — like HYOPSUNG NO.31.
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 9, 2026 22:38 UTC
Position
35.1097° N, 129.0683° E
Speed
0.0 kn
Course
197°
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Joining the Safety Initiative Network doesn't just put HYOPSUNG NO.31 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 HYOPSUNG NO.31 and switch it all on
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About HYOPSUNG NO.31
What kind of vessel is HYOPSUNG NO.31?
HYOPSUNG NO.31 is a Tug flagged to South Korea.
Where was HYOPSUNG NO.31 last seen?
HYOPSUNG NO.31 was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is HYOPSUNG NO.31's MMSI?
HYOPSUNG NO.31's MMSI is 440324360. Call sign SSD. IMO 9909974.
How big is HYOPSUNG NO.31?
HYOPSUNG NO.31 is about 33 m long, 10 m on the beam, drawing 1.3 m.
Is HYOPSUNG NO.31 on the Master's Mate Safety Initiative Network?
Not yet. If HYOPSUNG NO.31 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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