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.
Law Enforcement
SPN 21
MMSI 205477690 · Call sign OT4776
Not yet on Master's MateType
Law Enforcement
Flag
BELLength
19 m
Beam
6 m
Call sign
OT4776
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
53
SPN 21 is a boat hailing from Belgium, spanning 19 metres. Her hull carries a 6 m beam. Officially she's MMSI 205477690, call sign OT4776. SPN 21 is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.
Free forever · No credit card
Is SPN 21 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
Last known position · Jun 3, 2026
Position
51.2323° N, 4.4148° E
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 SPN 21 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 SPN 21 and switch it all on
Free to join · nothing to install to start · cancel anytime
About SPN 21
What kind of vessel is SPN 21?
SPN 21 is a Law Enforcement flagged to Belgium.
Where was SPN 21 last seen?
SPN 21 was last reported in the North Sea in Jun 2026 on public AIS.
What is SPN 21's MMSI?
SPN 21's MMSI is 205477690. Call sign OT4776.
How big is SPN 21?
SPN 21 is about 19 m long, 6 m on the beam.
Is SPN 21 on the Master's Mate Safety Initiative Network?
Not yet. If SPN 21 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.