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
SENTINEL II
U.S. Official No. 1351167
Not yet on Master's MateType
Unclassified
Flag
USALength
12.2 m
Beam
4.1 m
Draft
2 m
Hull ID
SWT42044G223
First reported
Jun 2026
AIS reports
1
SENTINEL II, an American vessel, measures 12.2 metres on deck. Below, she has a beam measuring 4.1 metres and a draft of 2 m. Officially she's U.S. official number 1351167. Bring SENTINEL II aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.
Free forever · No credit card
Is SENTINEL II 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 SENTINEL II 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 SENTINEL II 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 SENTINEL II and switch it all on
Free to join · nothing to install to start · cancel anytime
About SENTINEL II
What kind of vessel is SENTINEL II?
SENTINEL II is a Unclassified flagged to United States of America.
What is SENTINEL II's U.S. Official No.?
SENTINEL II's U.S. Official No. is 1351167.
How big is SENTINEL II?
SENTINEL II is about 12.2 m long, 4.1 m on the beam, drawing 2 m.
Is SENTINEL II on the Master's Mate Safety Initiative Network?
Not yet. If SENTINEL II is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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