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.
Other
SIENTJE
MMSI 244710939 · Call sign PB4511
Not yet on Master's MateType
Other
Flag
NLDLength
18 m
Beam
7 m
Draft
2.3 m
Call sign
PB4511
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
85
SIENTJE is a Dutch craft — 18 metres overall. Below, she has a 7-metre beam and a draft of 2.3 m. On the registers she's MMSI 244710939, call sign PB4511. SIENTJE belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.
Free forever · No credit card
Is SIENTJE 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 09:49 UTC
Position
51.8192° N, 4.7627° E
Status
Under way (engine)
Speed
0.0 kn
Course
314°
Destination
SLIEDRECHT
ETA
03-21 11:00 UTC
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.
Free with your claim
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put SIENTJE 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 SIENTJE and switch it all on
Free to join · nothing to install to start · cancel anytime
About SIENTJE
What kind of vessel is SIENTJE?
SIENTJE is a Other flagged to Netherlands.
Where was SIENTJE last seen?
SIENTJE was last reported in the North Sea in Jun 2026 on public AIS.
What is SIENTJE's MMSI?
SIENTJE's MMSI is 244710939. Call sign PB4511.
How big is SIENTJE?
SIENTJE is about 18 m long, 7 m on the beam, drawing 2.3 m.
Is SIENTJE on the Master's Mate Safety Initiative Network?
Not yet. If SIENTJE is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.