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

S.E.S. CHALLENGER

MMSI 366883320 · Call sign WBE4876

Not yet on Master's Mate

Type

Unclassified

Flag

USA

Length

12.3 m

Beam

3.7 m

Draft

1.9 m

Call sign

WBE4876

Official No.

989297

AIS reports

S.E.S. CHALLENGER is an American boat — 12.3 metres overall. Below, she has a beam measuring 3.7 metres and a draft of 1.9 m. Her registration reads MMSI 366883320, call sign WBE4876. Put S.E.S. CHALLENGER on the Master's Mate Safety Initiative Network — free to claim, with a whole fleet watching out for her.

Free forever · No credit card

Is S.E.S. 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.

Claim this boat — free →

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

Wherever S.E.S. 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.

Free with your claim

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

Joining the Safety Initiative Network doesn't just put S.E.S. 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 S.E.S. CHALLENGER and switch it all on

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Claim free → unlock everything

About S.E.S. CHALLENGER

What kind of vessel is S.E.S. CHALLENGER?

S.E.S. CHALLENGER is a Unclassified flagged to United States of America.

What is S.E.S. CHALLENGER's MMSI?

S.E.S. CHALLENGER's MMSI is 366883320. Call sign WBE4876.

How big is S.E.S. CHALLENGER?

S.E.S. CHALLENGER is about 12.3 m long, 3.7 m on the beam, drawing 1.9 m.

Is S.E.S. CHALLENGER on the Master's Mate Safety Initiative Network?

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