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.

Towing Vessel

SAN ANTONIO

MMSI 366904320 · Call sign WDB4967

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

20.5 m

Beam

5.8 m

Draft

2.1 m

Call sign

WDB4967

Official No.

239617

AIS reports

Registered in the United States, SAN ANTONIO is a 20.5-metre harbour workboat. She has a beam measuring 5.8 metres and a draft of 2.1 m. Her registration reads MMSI 366904320, call sign WDB4967. Join SAN ANTONIO to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.

Free forever · No credit card · for working boats

Built for boats that work — like SAN ANTONIO.

Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.

Rig her out — free →

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

Wherever SAN ANTONIO 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 working boats

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

Joining the Safety Initiative Network doesn't just put SAN ANTONIO on the map. It hands you the full bridge:

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.

Weather & Routing

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

Distress Mesh

Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.

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.

Onboard Cameras

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

Hail Any Captain

A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.

Claim SAN ANTONIO and switch it all on

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

Claim free → unlock everything

About SAN ANTONIO

What kind of vessel is SAN ANTONIO?

SAN ANTONIO is a Towing Vessel flagged to United States of America.

What is SAN ANTONIO's MMSI?

SAN ANTONIO's MMSI is 366904320. Call sign WDB4967.

How big is SAN ANTONIO?

SAN ANTONIO is about 20.5 m long, 5.8 m on the beam, drawing 2.1 m.

Is SAN ANTONIO on the Master's Mate Safety Initiative Network?

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