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.
Pleasure Craft
SEI
MMSI 205921530 · Call sign OP9215
Not yet on Master's MateType
Pleasure Craft
Flag
BELLength
12 m
Beam
4 m
Draft
1.5 m
Call sign
OP9215
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
29
SEI, a Belgian pleasure boat, measures 12 metres on deck. She has a beam of 4 m and a draft of 1.5 m. Her registration reads MMSI 205921530, call sign OP9215. SEI belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.
Free forever · No credit card · for recreational captains
Keep SEI looked after — even when you’re not aboard.
Anchor alarms that wake you, a live camera at the dock, and weather you can trust before every run.
Look after her — claim free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Jun 3, 2026
Position
51.2253° N, 2.9401° E
Cruising 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 · for recreational captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put SEI 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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
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 SEI and switch it all on
Free to join · nothing to install to start · cancel anytime
About SEI
What kind of vessel is SEI?
SEI is a Pleasure Craft flagged to Belgium.
Where was SEI last seen?
SEI was last reported in the North Sea in Jun 2026 on public AIS.
What is SEI's MMSI?
SEI's MMSI is 205921530. Call sign OP9215.
How big is SEI?
SEI is about 12 m long, 4 m on the beam, drawing 1.5 m.
Is SEI on the Master's Mate Safety Initiative Network?
Not yet. If SEI is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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