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
FOUR THOUSAND
U.S. Official No. 510850
Not yet on Master's MateType
Unclassified
Flag
USALength
12.5 m
Beam
6.1 m
Draft
1.4 m
First reported
Jun 2026
AIS reports
1
FOUR THOUSAND flies the American flag — a 12.5-metre craft. She carries 6.1 metres in the beam and a 1.4 m draft. Her registration reads U.S. official number 510850. Add FOUR THOUSAND to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.
Free forever · No credit card
Is FOUR THOUSAND 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 FOUR THOUSAND 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 FOUR THOUSAND 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 FOUR THOUSAND and switch it all on
Free to join · nothing to install to start · cancel anytime
About FOUR THOUSAND
What kind of vessel is FOUR THOUSAND?
FOUR THOUSAND is a Unclassified flagged to United States of America.
What is FOUR THOUSAND's U.S. Official No.?
FOUR THOUSAND's U.S. Official No. is 510850.
How big is FOUR THOUSAND?
FOUR THOUSAND is about 12.5 m long, 6.1 m on the beam, drawing 1.4 m.
Is FOUR THOUSAND on the Master's Mate Safety Initiative Network?
Not yet. If FOUR THOUSAND 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.