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.
Recreational
B J IV
U.S. Official No. 513850
Not yet on Master's MateType
Recreational
Flag
USALength
10.2 m
Beam
3.7 m
Draft
1 m
First reported
Jun 2026
AIS reports
1
Registered in the United States, B J IV is a 10.2-metre private cruiser. Her hull carries a beam of 3.7 m and a draft measuring 1 metres. On the registers she's U.S. official number 513850. Join B J IV to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.
Free forever · No credit card · for recreational captains
Keep B J IV looked after — even when you’re not aboard.
Anchor alarms that wake you, a live camera at the dock, and weather you can trust before every run.
Look after her — claim free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever B J IV 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 recreational captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put B J IV on the map. It hands you the full bridge:
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim B J IV and switch it all on
Free to join · nothing to install to start · cancel anytime
About B J IV
What kind of vessel is B J IV?
B J IV is a Recreational flagged to United States of America.
What is B J IV's U.S. Official No.?
B J IV's U.S. Official No. is 513850.
How big is B J IV?
B J IV is about 10.2 m long, 3.7 m on the beam, drawing 1 m.
Is B J IV on the Master's Mate Safety Initiative Network?
Not yet. If B J IV 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.