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.
Vessel
U-21
Cayman Islands · last seen 41°N 14°E · Jun 2026 · MMSI 319138400
Not yet on Master's MateFlag
CYMFirst reported
Jun 2026
Last reported
Jun 2026
AIS reports
9
Registered in the Cayman Islands, U-21 is a craft. Find her under MMSI 319138400. The Master's Mate Safety Initiative Network welcomes U-21 — free to join, cruiser-run, and always on watch.
Free forever · No credit card
Is U-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
Last known position · Jun 4, 2026
Position
40.8239° N, 14.2416° E
Crossing the Adriatic Sea? 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 U-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 U-21 and switch it all on
Free to join · nothing to install to start · cancel anytime
About U-21
What kind of vessel is U-21?
U-21 is a vessel flagged to Cayman Islands.
Where was U-21 last seen?
U-21 was last reported in the Adriatic Sea in Jun 2026 on public AIS.
What is U-21's MMSI?
U-21's MMSI is 319138400.
Is U-21 on the Master's Mate Safety Initiative Network?
Not yet. If U-21 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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