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
BB4
MMSI 367073430 · Call sign WDC7568
Not yet on Master's MateType
Towing Vessel
Flag
USALength
11.3 m
Beam
4.9 m
Draft
1.9 m
Call sign
WDC7568
Official No.
513612
AIS reports
1
An American working vessel, BB4 measures 11.3 metres. Her hull carries a 4.9 m beam and a draft measuring 1.9 metres. On AIS she shows as MMSI 367073430, call sign WDC7568. Add BB4 to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.
Free forever · No credit card · for working boats
Built for boats that work — like BB4.
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 BB4 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 BB4 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 BB4 and switch it all on
Free to join · nothing to install to start · cancel anytime
About BB4
What kind of vessel is BB4?
BB4 is a Towing Vessel flagged to United States of America.
What is BB4's MMSI?
BB4's MMSI is 367073430. Call sign WDC7568.
How big is BB4?
BB4 is about 11.3 m long, 4.9 m on the beam, drawing 1.9 m.
Is BB4 on the Master's Mate Safety Initiative Network?
Not yet. If BB4 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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