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

JOHN HENRY

MMSI 368081390 · Call sign WDL8217

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

20.8 m

Beam

7.3 m

Draft

2.4 m

Call sign

WDL8217

Official No.

272726

AIS reports

JOHN HENRY is an American workboat, 20.8 metres in length. JOHN HENRY has 7.3 metres in the beam and a 2.4 m draft. On AIS she shows as MMSI 368081390, call sign WDL8217. Sign JOHN HENRY 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 working boats

Built for boats that work — like JOHN HENRY.

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 JOHN HENRY 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 JOHN HENRY 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 JOHN HENRY and switch it all on

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About JOHN HENRY

What kind of vessel is JOHN HENRY?

JOHN HENRY is a Towing Vessel flagged to United States of America.

What is JOHN HENRY's MMSI?

JOHN HENRY's MMSI is 368081390. Call sign WDL8217.

How big is JOHN HENRY?

JOHN HENRY is about 20.8 m long, 7.3 m on the beam, drawing 2.4 m.

Is JOHN HENRY on the Master's Mate Safety Initiative Network?

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