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.
Unclassified
BOATHOUSE H-21
U.S. Official No. 1236640
Not yet on Master's MateType
Unclassified
Flag
USALength
20.8 m
Beam
6.8 m
Draft
0.9 m
First reported
Jun 2026
AIS reports
1
Out of the United States, BOATHOUSE H-21 is a 20.8-metre craft. She carries a beam measuring 6.8 metres and a 0.9 m draft. Her registration reads U.S. official number 1236640. The Master's Mate Safety Initiative Network welcomes BOATHOUSE H-21 — free to join, cruiser-run, and always on watch.
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Is BOATHOUSE H-21 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 BOATHOUSE H-21 roams, you're never out there alone.
Thousands of cruisers on the Master's Mate Network — ready to help the moment something goes wrong.
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The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put BOATHOUSE H-21 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 BOATHOUSE H-21 and switch it all on
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About BOATHOUSE H-21
What kind of vessel is BOATHOUSE H-21?
BOATHOUSE H-21 is a Unclassified flagged to United States of America.
What is BOATHOUSE H-21's U.S. Official No.?
BOATHOUSE H-21's U.S. Official No. is 1236640.
How big is BOATHOUSE H-21?
BOATHOUSE H-21 is about 20.8 m long, 6.8 m on the beam, drawing 0.9 m.
Is BOATHOUSE H-21 on the Master's Mate Safety Initiative Network?
Not yet. If BOATHOUSE H-21 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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