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.

Offshore Supply Vessel

JOHN GRAHAM

MMSI 366743080 · Call sign WCV3973

Not yet on Master's Mate

Type

Offshore Supply Vessel

Flag

USA

Length

56.4 m

Beam

12.2 m

Draft

4.4 m

Call sign

WCV3973

IMO

8123509

Official No.

648172

AIS reports

JOHN GRAHAM flies the American flag — a 56.4-metre utility vessel. She's built with a 12.2 m beam and a 4.4-metre draft. On AIS she shows as MMSI 366743080, call sign WCV3973, IMO 8123509. Working vessels like JOHN GRAHAM are never truly alone on the Master's Mate Safety Initiative Network — free, with a fleet on watch.

Free forever · No credit card · for working boats

Built for boats that work — like JOHN GRAHAM.

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 GRAHAM 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 GRAHAM 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 GRAHAM and switch it all on

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About JOHN GRAHAM

What kind of vessel is JOHN GRAHAM?

JOHN GRAHAM is a Offshore Supply Vessel flagged to United States of America.

What is JOHN GRAHAM's MMSI?

JOHN GRAHAM's MMSI is 366743080. Call sign WCV3973. IMO 8123509.

How big is JOHN GRAHAM?

JOHN GRAHAM is about 56.4 m long, 12.2 m on the beam, drawing 4.4 m.

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

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