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
Jonathan S
MMSI 366904040 · Call sign WDB4942
Not yet on Master's MateType
Commercial Fishing Vessel
Flag
USALength
15.1 m
Beam
4.2 m
Draft
2.1 m
Call sign
WDB4942
Official No.
645425
Hull ID
HSR02111M82C
AIS reports
1
Registered in the United States, Jonathan S is a 15.1-metre working fishing vessel. She has a beam of 4.2 m and a draft measuring 2.1 metres. Her registration reads MMSI 366904040, call sign WDB4942. The Master's Mate Safety Initiative Network welcomes Jonathan S — free to join, cruiser-run, and always on watch.
Free forever · No credit card · for working captains
Know where the fleet is. Get Jonathan S 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 Jonathan 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 captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Jonathan S 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 Jonathan S and switch it all on
Free to join · nothing to install to start · cancel anytime
About Jonathan S
What kind of vessel is Jonathan S?
Jonathan S is a Commercial Fishing Vessel flagged to United States of America.
What is Jonathan S's MMSI?
Jonathan S's MMSI is 366904040. Call sign WDB4942.
How big is Jonathan S?
Jonathan S is about 15.1 m long, 4.2 m on the beam, drawing 2.1 m.
Is Jonathan S on the Master's Mate Safety Initiative Network?
Not yet. If Jonathan S is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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