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

J. Thomas

MMSI 367673340 · Call sign WDH9961

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

21.1 m

Beam

9.1 m

Draft

3 m

Call sign

WDH9961

Official No.

1255923

AIS reports

Registered in the United States, J. Thomas is a 21.1-metre harbour workboat. Below, she has a beam of 9.1 m and a draft of 3 m. She broadcasts as MMSI 367673340, call sign WDH9961. Bring J. Thomas aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.

Free forever · No credit card · for working boats

Built for boats that work — like J. Thomas.

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 J. Thomas 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 J. Thomas 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 J. Thomas and switch it all on

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

Claim free → unlock everything

About J. Thomas

What kind of vessel is J. Thomas?

J. Thomas is a Towing Vessel flagged to United States of America.

What is J. Thomas's MMSI?

J. Thomas's MMSI is 367673340. Call sign WDH9961.

How big is J. Thomas?

J. Thomas is about 21.1 m long, 9.1 m on the beam, drawing 3 m.

Is J. Thomas on the Master's Mate Safety Initiative Network?

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