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.
Vessel
Half Moon Bay
MMSI 367124090 · Call sign WDN4090
Not yet on Master's MateFlag
USALength
32 m
Call sign
WDN4090
IMO
8003199
Official No.
615796
AIS reports
4
On the American registry, Half Moon Bay is a 32-metre vessel. She's on record as MMSI 367124090, call sign WDN4090, IMO 8003199. Half Moon Bay belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.
Free forever · No credit card
Is Half Moon Bay your boat?
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Half Moon Bay 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
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Half Moon Bay 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.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
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.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim Half Moon Bay and switch it all on
Free to join · nothing to install to start · cancel anytime
About Half Moon Bay
What kind of vessel is Half Moon Bay?
Half Moon Bay is a vessel flagged to United States of America.
What is Half Moon Bay's MMSI?
Half Moon Bay's MMSI is 367124090. Call sign WDN4090. IMO 8003199.
How big is Half Moon Bay?
Half Moon Bay is about 32 m long.
Is Half Moon Bay on the Master's Mate Safety Initiative Network?
Not yet. If Half Moon Bay is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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