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
BIG JOHN
U.S. Official No. 275337
Not yet on Master's MateType
Towing Vessel
Flag
USALength
15.6 m
Beam
5.5 m
Draft
2.1 m
First reported
Jun 2026
AIS reports
1
An American working craft, BIG JOHN measures 15.6 metres. Her hull carries 5.5 metres in the beam and a draft of 2.1 m. Officially she's U.S. official number 275337. Give BIG JOHN the backing of the Master's Mate Safety Initiative Network — free, and a fleet that has her back.
Free forever · No credit card · for working boats
Built for boats that work — like BIG JOHN.
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 BIG 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 boats
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put BIG JOHN 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 BIG JOHN and switch it all on
Free to join · nothing to install to start · cancel anytime
About BIG JOHN
What kind of vessel is BIG JOHN?
BIG JOHN is a Towing Vessel flagged to United States of America.
What is BIG JOHN's U.S. Official No.?
BIG JOHN's U.S. Official No. is 275337.
How big is BIG JOHN?
BIG JOHN is about 15.6 m long, 5.5 m on the beam, drawing 2.1 m.
Is BIG JOHN on the Master's Mate Safety Initiative Network?
Not yet. If BIG JOHN is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.