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
UL SAN 305
MMSI 440211280 · Call sign 123
Not yet on Master's MateType
Tug
Flag
KORLength
26 m
Beam
8 m
Call sign
123
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
26
UL SAN 305, a working tug flagged in South Korea, measures 26 metres on deck. She's built with a 8-metre beam. Officially she's MMSI 440211280, call sign 123. Claim UL SAN 305 free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.
Free forever · No credit card · for working boats
Built for boats that work — like UL SAN 305.
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
35.2492° N, 129.3052° 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 UL SAN 305 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 UL SAN 305 and switch it all on
Free to join · nothing to install to start · cancel anytime
About UL SAN 305
What kind of vessel is UL SAN 305?
UL SAN 305 is a Tug flagged to South Korea.
Where was UL SAN 305 last seen?
UL SAN 305 was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is UL SAN 305's MMSI?
UL SAN 305's MMSI is 440211280. Call sign 123.
How big is UL SAN 305?
UL SAN 305 is about 26 m long, 8 m on the beam.
Is UL SAN 305 on the Master's Mate Safety Initiative Network?
Not yet. If UL SAN 305 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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