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.

Recreational

Sea Otter

MMSI 366893120 · Call sign WDB3955

Not yet on Master's Mate

Type

Recreational

Flag

USA

Length

12.9 m

Beam

4.5 m

Draft

2.4 m

Call sign

WDB3955

Official No.

517144

AIS reports

Out of the United States, Sea Otter is a 12.9-metre family boat. She carries a beam measuring 4.5 metres and a 2.4-metre draft. On AIS she shows as MMSI 366893120, call sign WDB3955. Sign Sea Otter up free to the Master's Mate Safety Initiative Network and join a fleet that looks after its own.

Free forever · No credit card · for recreational captains

Keep Sea Otter looked after — even when you’re not aboard.

Anchor alarms that wake you, a live camera at the dock, and weather you can trust before every run.

Look after her — claim free →

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

Wherever Sea Otter 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 · for recreational captains

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

Joining the Safety Initiative Network doesn't just put Sea Otter 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.

Onboard Cameras

Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.

Weather & Routing

GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.

Worldwide Charts

Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.

Systems Monitoring

Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.

Live AIS & Traffic

See every vessel around you in real time. Closest-approach warnings before they matter.

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 Sea Otter and switch it all on

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

Claim free → unlock everything

About Sea Otter

What kind of vessel is Sea Otter?

Sea Otter is a Recreational flagged to United States of America.

What is Sea Otter's MMSI?

Sea Otter's MMSI is 366893120. Call sign WDB3955.

How big is Sea Otter?

Sea Otter is about 12.9 m long, 4.5 m on the beam, drawing 2.4 m.

Is Sea Otter on the Master's Mate Safety Initiative Network?

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