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.
Commercial Fishing Vessel
John Mary
MMSI 366808380 · Call sign WDA4341
Not yet on Master's MateType
Commercial Fishing Vessel
Flag
USALength
21.7 m
Beam
6.7 m
Draft
3.2 m
Call sign
WDA4341
IMO
8886553
Official No.
650816
AIS reports
1
John Mary is an American fishing craft — 21.7 metres overall. She has a beam measuring 6.7 metres and a draft measuring 3.2 metres. She's listed under MMSI 366808380, call sign WDA4341, IMO 8886553. John Mary belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.
Free forever · No credit card · for working captains
Know where the fleet is. Get John Mary home safe.
Live AIS traffic, weather you can plan around, engine & systems telemetry, and a distress mesh that reaches nearby boats.
Keep the fleet in sight — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever John Mary 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 captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put John Mary on the map. It hands you the full bridge:
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.
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
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 Mary and switch it all on
Free to join · nothing to install to start · cancel anytime
About John Mary
What kind of vessel is John Mary?
John Mary is a Commercial Fishing Vessel flagged to United States of America.
What is John Mary's MMSI?
John Mary's MMSI is 366808380. Call sign WDA4341. IMO 8886553.
How big is John Mary?
John Mary is about 21.7 m long, 6.7 m on the beam, drawing 3.2 m.
Is John Mary on the Master's Mate Safety Initiative Network?
Not yet. If John Mary is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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