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
SIR JOHN
U.S. Official No. 509162
Not yet on Master's MateType
Commercial Fishing Vessel
Flag
USALength
18 m
Beam
6.2 m
Draft
2.2 m
First reported
Jun 2026
AIS reports
1
SIR JOHN, a fishing vessel hailing from the United States, measures 18 metres on deck. SIR JOHN has a beam measuring 6.2 metres and a 2.2-metre draft. She's listed under U.S. official number 509162. SIR JOHN 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 captains
Know where the fleet is. Get SIR JOHN 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 SIR JOHN 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 SIR JOHN 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 SIR JOHN and switch it all on
Free to join · nothing to install to start · cancel anytime
About SIR JOHN
What kind of vessel is SIR JOHN?
SIR JOHN is a Commercial Fishing Vessel flagged to United States of America.
What is SIR JOHN's U.S. Official No.?
SIR JOHN's U.S. Official No. is 509162.
How big is SIR JOHN?
SIR JOHN is about 18 m long, 6.2 m on the beam, drawing 2.2 m.
Is SIR JOHN on the Master's Mate Safety Initiative Network?
Not yet. If SIR JOHN is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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