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.

Unclassified

American Challenger

MMSI 366664240 · Call sign WDC4211

Not yet on Master's Mate

Type

Unclassified

Flag

USA

Length

27.5 m

Beam

8 m

Draft

4.2 m

Call sign

WDC4211

IMO

8024844

Official No.

633219

AIS reports

American Challenger, a vessel hailing from the United States, measures 27.5 metres on deck. She carries 8 metres in the beam and a 4.2 m draft. Officially she's MMSI 366664240, call sign WDC4211, IMO 8024844. Put American Challenger on the Master's Mate Safety Initiative Network — free to claim, with a whole fleet watching out for her.

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Is American Challenger 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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Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers

Wherever American Challenger 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 American Challenger 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 American Challenger and switch it all on

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About American Challenger

What kind of vessel is American Challenger?

American Challenger is a Unclassified flagged to United States of America.

What is American Challenger's MMSI?

American Challenger's MMSI is 366664240. Call sign WDC4211. IMO 8024844.

How big is American Challenger?

American Challenger is about 27.5 m long, 8 m on the beam, drawing 4.2 m.

Is American Challenger on the Master's Mate Safety Initiative Network?

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