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
Big Oh
MMSI 367763640 · Call sign WDJ2981
Not yet on Master's MateType
Recreational
Flag
USALength
19.2 m
Beam
5.1 m
Draft
2.7 m
Call sign
WDJ2981
Official No.
1201932
AIS reports
1
Big Oh is a recreational vessel flying the American flag, spanning 19.2 metres. She has a 5.1-metre beam and a draft measuring 2.7 metres. She broadcasts as MMSI 367763640, call sign WDJ2981. Join Big Oh to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.
Free forever · No credit card · for recreational captains
Keep Big Oh 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 Big Oh 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 Big Oh 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 Big Oh and switch it all on
Free to join · nothing to install to start · cancel anytime
About Big Oh
What kind of vessel is Big Oh?
Big Oh is a Recreational flagged to United States of America.
What is Big Oh's MMSI?
Big Oh's MMSI is 367763640. Call sign WDJ2981.
How big is Big Oh?
Big Oh is about 19.2 m long, 5.1 m on the beam, drawing 2.7 m.
Is Big Oh on the Master's Mate Safety Initiative Network?
Not yet. If Big Oh is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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