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
YUEN KOK
MMSI 477991700 · Call sign VRAP4
Not yet on Master's MateType
Tug
Flag
HKGLength
24 m
Beam
8 m
Draft
2 m
Call sign
VRAP4
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
53
Registered in Hong Kong, YUEN KOK is a 24-metre tugboat. She carries a 8 m beam and a 2 m draft. She broadcasts as MMSI 477991700, call sign VRAP4. Put YUEN KOK on the Master's Mate Safety Initiative Network — free to claim, with a whole fleet watching out for her.
Free forever · No credit card · for working boats
Built for boats that work — like YUEN KOK.
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 3, 2026
Position
22.3664° N, 114.0998° E
Working the South China Sea? 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 YUEN KOK 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 YUEN KOK and switch it all on
Free to join · nothing to install to start · cancel anytime
About YUEN KOK
What kind of vessel is YUEN KOK?
YUEN KOK is a Tug flagged to Hong Kong S.A.R..
Where was YUEN KOK last seen?
YUEN KOK was last reported in the South China Sea in Jun 2026 on public AIS.
What is YUEN KOK's MMSI?
YUEN KOK's MMSI is 477991700. Call sign VRAP4.
How big is YUEN KOK?
YUEN KOK is about 24 m long, 8 m on the beam, drawing 2 m.
Is YUEN KOK on the Master's Mate Safety Initiative Network?
Not yet. If YUEN KOK is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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