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.
Military
HS-4 SLEIPNER
MMSI 259046000 · Call sign JWCC
Not yet on Master's MateType
Military
Flag
NORLength
23 m
Beam
9 m
Call sign
JWCC
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
69
HS-4 SLEIPNER, a boat under the Norwegian flag, measures 23 metres on deck. She's built with 9 metres in the beam. On the registers she's MMSI 259046000, call sign JWCC. HS-4 SLEIPNER can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.
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Is HS-4 SLEIPNER your boat?
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Live AIS position · Jun 9, 2026 13:38 UTC
Position
60.3390° N, 5.2370° E
Status
Moored
Speed
0.0 kn
Course
179°
Crossing the North Sea? 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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The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put HS-4 SLEIPNER on the map. It hands you the full bridge:
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.
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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
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.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim HS-4 SLEIPNER and switch it all on
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About HS-4 SLEIPNER
What kind of vessel is HS-4 SLEIPNER?
HS-4 SLEIPNER is a Military flagged to Norway.
Where was HS-4 SLEIPNER last seen?
HS-4 SLEIPNER was last reported in the North Sea in Jun 2026 on public AIS.
What is HS-4 SLEIPNER's MMSI?
HS-4 SLEIPNER's MMSI is 259046000. Call sign JWCC.
How big is HS-4 SLEIPNER?
HS-4 SLEIPNER is about 23 m long, 9 m on the beam.
Is HS-4 SLEIPNER on the Master's Mate Safety Initiative Network?
Not yet. If HS-4 SLEIPNER is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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