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 S

MMSI 368296320 · Call sign WDN6136

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

7.7 m

Beam

4.3 m

Draft

1.5 m

Call sign

WDN6136

Official No.

1301699

AIS reports

JOHN S is an American working craft, 7.7 metres LOA. Below, she has 4.3 metres in the beam and a draft of 1.5 m. On AIS she appears as MMSI 368296320, call sign WDN6136. JOHN S is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.

Free forever · No credit card · for working boats

Built for boats that work — like JOHN S.

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 S 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 S 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 S and switch it all on

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Claim free → unlock everything

About JOHN S

What kind of vessel is JOHN S?

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

What is JOHN S's MMSI?

JOHN S's MMSI is 368296320. Call sign WDN6136.

How big is JOHN S?

JOHN S is about 7.7 m long, 4.3 m on the beam, drawing 1.5 m.

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

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