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
Sir Johnathan
MMSI 367683560 · Call sign WDI2964
Not yet on Master's MateType
Towing Vessel
Flag
USALength
18.6 m
Beam
7.3 m
Draft
2 m
Call sign
WDI2964
Official No.
571246
AIS reports
1
Registered in the United States, Sir Johnathan is an 18.6-metre utility vessel. She carries 7.3 metres in the beam and a 2-metre draft. Officially she's MMSI 367683560, call sign WDI2964. Sir Johnathan 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 Sir Johnathan.
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 Sir Johnathan 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 Sir Johnathan 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 Sir Johnathan and switch it all on
Free to join · nothing to install to start · cancel anytime
About Sir Johnathan
What kind of vessel is Sir Johnathan?
Sir Johnathan is a Towing Vessel flagged to United States of America.
What is Sir Johnathan's MMSI?
Sir Johnathan's MMSI is 367683560. Call sign WDI2964.
How big is Sir Johnathan?
Sir Johnathan is about 18.6 m long, 7.3 m on the beam, drawing 2 m.
Is Sir Johnathan on the Master's Mate Safety Initiative Network?
Not yet. If Sir Johnathan is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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