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 T MCMAHAN
MMSI 367351820 · Call sign WDE4349
Not yet on Master's MateType
Towing Vessel
Flag
USALength
21.9 m
Beam
9.1 m
Draft
3 m
Call sign
WDE4349
Official No.
1210447
AIS reports
1
Registered in the United States, JOHN T MCMAHAN is a 21.9-metre harbour workboat. Her hull carries 9.1 metres in the beam and a draft of 3 m. On AIS she appears as MMSI 367351820, call sign WDE4349. JOHN T MCMAHAN can be part of the Master's Mate Safety Initiative Network at no cost — a community watch that never sleeps.
Free forever · No credit card · for working boats
Built for boats that work — like JOHN T MCMAHAN.
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 T MCMAHAN 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 T MCMAHAN 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 T MCMAHAN and switch it all on
Free to join · nothing to install to start · cancel anytime
About JOHN T MCMAHAN
What kind of vessel is JOHN T MCMAHAN?
JOHN T MCMAHAN is a Towing Vessel flagged to United States of America.
What is JOHN T MCMAHAN's MMSI?
JOHN T MCMAHAN's MMSI is 367351820. Call sign WDE4349.
How big is JOHN T MCMAHAN?
JOHN T MCMAHAN is about 21.9 m long, 9.1 m on the beam, drawing 3 m.
Is JOHN T MCMAHAN on the Master's Mate Safety Initiative Network?
Not yet. If JOHN T MCMAHAN is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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