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

Sibley

MMSI 368069840 · Call sign WDK5952

Not yet on Master's Mate

Flag

USA

Call sign

WDK5952

Official No.

591551

AIS reports

Sibley is a boat flying the flag of the United States. On AIS she shows as MMSI 368069840, call sign WDK5952. Add Sibley to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.

Free forever · No credit card

Is Sibley 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 Sibley 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 Sibley 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 Sibley and switch it all on

Free to join · nothing to install to start · cancel anytime

Claim free → unlock everything

About Sibley

What kind of vessel is Sibley?

Sibley is a vessel flagged to United States of America.

What is Sibley's MMSI?

Sibley's MMSI is 368069840. Call sign WDK5952.

Is Sibley on the Master's Mate Safety Initiative Network?

Not yet. If Sibley is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).