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

Douglas MacArthur

MMSI 367132840 · Call sign WDD3539

Not yet on Master's Mate

Flag

USA

Call sign

WDD3539

Official No.

650228

AIS reports

Douglas MacArthur is an American boat. She broadcasts as MMSI 367132840, call sign WDD3539. Douglas MacArthur belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.

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Is Douglas MacArthur 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.

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Wherever Douglas MacArthur roams, you're never out there alone.

Thousands of cruisers on the Master's Mate Network — ready to help the moment something goes wrong.

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The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put Douglas MacArthur 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 Douglas MacArthur and switch it all on

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About Douglas MacArthur

What kind of vessel is Douglas MacArthur?

Douglas MacArthur is a vessel flagged to United States of America.

What is Douglas MacArthur's MMSI?

Douglas MacArthur's MMSI is 367132840. Call sign WDD3539.

Is Douglas MacArthur on the Master's Mate Safety Initiative Network?

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