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

IA7521BV

MMSI 368277240 · Call sign WDN4021

Not yet on Master's Mate

Flag

USA

Call sign

WDN4021

Official No.

IA7521BV

AIS reports

IA7521BV is a boat flying the American flag. Her registration reads MMSI 368277240, call sign WDN4021. The Master's Mate Safety Initiative Network welcomes IA7521BV — free to join, cruiser-run, and always on watch.

Free forever · No credit card

Is IA7521BV 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 IA7521BV 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 IA7521BV 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 IA7521BV and switch it all on

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About IA7521BV

What kind of vessel is IA7521BV?

IA7521BV is a vessel flagged to United States of America.

What is IA7521BV's MMSI?

IA7521BV's MMSI is 368277240. Call sign WDN4021.

Is IA7521BV on the Master's Mate Safety Initiative Network?

Not yet. If IA7521BV is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).