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
H3O
U.S. Official No. 1327821
Not yet on Master's MateType
Recreational
Flag
USALength
9.1 m
Beam
2.9 m
Draft
1.4 m
First reported
Jun 2026
AIS reports
1
H3O, a leisure boat flagged in the United States, measures 9.1 metres on deck. H3O has a beam of 2.9 m and a 1.4 m draft. Look for U.S. official number 1327821. Claim H3O free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.
Free forever · No credit card · for recreational captains
Keep H3O 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 H3O 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 H3O 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 H3O and switch it all on
Free to join · nothing to install to start · cancel anytime
About H3O
What kind of vessel is H3O?
H3O is a Recreational flagged to United States of America.
What is H3O's U.S. Official No.?
H3O's U.S. Official No. is 1327821.
How big is H3O?
H3O is about 9.1 m long, 2.9 m on the beam, drawing 1.4 m.
Is H3O on the Master's Mate Safety Initiative Network?
Not yet. If H3O is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.