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.
Vessel
ONCE SUNK
MMSI 366632370 · Call sign WCL7563
Not yet on Master's MateFlag
USACall sign
WCL7563
Official No.
MD4785C
AIS reports
1
Registered in the United States, ONCE SUNK is a boat. She broadcasts as MMSI 366632370, call sign WCL7563. The Master's Mate Safety Initiative Network welcomes ONCE SUNK — free to join, cruiser-run, and always on watch.
Free forever · No credit card
Is ONCE SUNK 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
Wherever ONCE SUNK roams, 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 ONCE SUNK 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 ONCE SUNK and switch it all on
Free to join · nothing to install to start · cancel anytime
About ONCE SUNK
What kind of vessel is ONCE SUNK?
ONCE SUNK is a vessel flagged to United States of America.
What is ONCE SUNK's MMSI?
ONCE SUNK's MMSI is 366632370. Call sign WCL7563.
Is ONCE SUNK on the Master's Mate Safety Initiative Network?
Not yet. If ONCE SUNK 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.