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.
Tank Barge
STC 351B
U.S. Official No. 691817
Not yet on Master's MateType
Tank Barge
Flag
USALength
45 m
Beam
16 m
Draft
4 m
First reported
Jun 2026
AIS reports
1
Registered in the United States, STC 351B is a 45-metre tank ship. She has a beam measuring 16 metres and a draft measuring 4 metres. On the registers she's U.S. official number 691817. STC 351B can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.
Free forever · No credit card · for commercial operators
Eyes on STC 351B, around the clock.
Real-time AIS, full systems telemetry, distress alerting and worldwide charts — your hull on one dashboard, from anywhere.
Put her on the dashboard — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever STC 351B 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 · for commercial operators
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put STC 351B on the map. It hands you the full bridge:
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
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.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim STC 351B and switch it all on
Free to join · nothing to install to start · cancel anytime
About STC 351B
What kind of vessel is STC 351B?
STC 351B is a Tank Barge flagged to United States of America.
What is STC 351B's U.S. Official No.?
STC 351B's U.S. Official No. is 691817.
How big is STC 351B?
STC 351B is about 45 m long, 16 m on the beam, drawing 4 m.
Is STC 351B on the Master's Mate Safety Initiative Network?
Not yet. If STC 351B is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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