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
WB IV
U.S. Official No. 681500
Not yet on Master's MateType
Commercial Fishing Vessel
Flag
USALength
11.2 m
Beam
3.3 m
Draft
1 m
First reported
Jun 2026
AIS reports
1
WB IV, a commercial fishing vessel under the American flag, measures 11.2 metres on deck. WB IV has a beam measuring 3.3 metres and a 1 m draft. Look for U.S. official number 681500. WB IV can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.
Free forever · No credit card · for working captains
Know where the fleet is. Get WB IV 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 WB 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 working captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put WB IV 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 WB IV and switch it all on
Free to join · nothing to install to start · cancel anytime
About WB IV
What kind of vessel is WB IV?
WB IV is a Commercial Fishing Vessel flagged to United States of America.
What is WB IV's U.S. Official No.?
WB IV's U.S. Official No. is 681500.
How big is WB IV?
WB IV is about 11.2 m long, 3.3 m on the beam, drawing 1 m.
Is WB IV on the Master's Mate Safety Initiative Network?
Not yet. If WB IV is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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