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.
Recreational
SQUARE ONE
MMSI 368237380 · Call sign WDN4641
Not yet on Master's MateType
Recreational
Flag
USALength
15.4 m
Beam
8 m
Draft
3.8 m
Call sign
WDN4641
Official No.
1308376
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
57
Out of the United States, SQUARE ONE is a 15.4-metre pleasure craft. She carries a beam of 8 m and a 3.8-metre draft. On the registers she's MMSI 368237380, call sign WDN4641. SQUARE ONE is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.
Free forever · No credit card · for recreational captains
Keep SQUARE ONE 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
37.3270° N, 23.1448° E
Cruising the Aegean 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 SQUARE ONE 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 SQUARE ONE and switch it all on
Free to join · nothing to install to start · cancel anytime
About SQUARE ONE
What kind of vessel is SQUARE ONE?
SQUARE ONE is a Recreational flagged to United States of America.
Where was SQUARE ONE last seen?
SQUARE ONE was last reported in the Aegean Sea in Jun 2026 on public AIS.
What is SQUARE ONE's MMSI?
SQUARE ONE's MMSI is 368237380. Call sign WDN4641.
How big is SQUARE ONE?
SQUARE ONE is about 15.4 m long, 8 m on the beam, drawing 3.8 m.
Is SQUARE ONE on the Master's Mate Safety Initiative Network?
Not yet. If SQUARE ONE is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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