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
ONE HALF SEA
U.S. Official No. 545826
Not yet on Master's MateType
Recreational
Flag
USALength
12.2 m
Beam
3.9 m
Draft
2.5 m
First reported
Jun 2026
AIS reports
1
Registered in the United States, ONE HALF SEA is a 12.2-metre private cruiser. Her hull carries a beam of 3.9 m and a draft of 2.5 m. Her papers read U.S. official number 545826. Claim ONE HALF SEA free and let the Master's Mate Safety Initiative Network keep an eye on her, on the water or off.
Free forever · No credit card · for recreational captains
Keep ONE HALF SEA 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 ONE HALF SEA 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 ONE HALF SEA 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 ONE HALF SEA and switch it all on
Free to join · nothing to install to start · cancel anytime
About ONE HALF SEA
What kind of vessel is ONE HALF SEA?
ONE HALF SEA is a Recreational flagged to United States of America.
What is ONE HALF SEA's U.S. Official No.?
ONE HALF SEA's U.S. Official No. is 545826.
How big is ONE HALF SEA?
ONE HALF SEA is about 12.2 m long, 3.9 m on the beam, drawing 2.5 m.
Is ONE HALF SEA on the Master's Mate Safety Initiative Network?
Not yet. If ONE HALF SEA is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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