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
MARTHA B
U.S. Official No. 228020
Not yet on Master's MateType
Unclassified
Flag
USALength
13.9 m
Beam
4 m
Draft
1.3 m
First reported
Jun 2026
AIS reports
1
Out of the United States, MARTHA B is a 13.9-metre boat. She's built with a 4-metre beam and a 1.3 m draft. Her registration reads U.S. official number 228020. MARTHA B is welcome on the Master's Mate Safety Initiative Network — a free, community-run watch where boats look out for one another.
Free forever · No credit card
Is MARTHA B 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 MARTHA B 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 MARTHA B 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 MARTHA B and switch it all on
Free to join · nothing to install to start · cancel anytime
About MARTHA B
What kind of vessel is MARTHA B?
MARTHA B is a Unclassified flagged to United States of America.
What is MARTHA B's U.S. Official No.?
MARTHA B's U.S. Official No. is 228020.
How big is MARTHA B?
MARTHA B is about 13.9 m long, 4 m on the beam, drawing 1.3 m.
Is MARTHA B on the Master's Mate Safety Initiative Network?
Not yet. If MARTHA B is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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