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

SJT 4

U.S. Official No. 263376

Not yet on Master's Mate

Type

Tank Barge

Flag

USA

Length

80.8 m

Beam

15.3 m

Draft

3.2 m

First reported

Jun 2026

AIS reports

SJT 4 is an American tank ship — 80.8 metres overall. She's built with a 15.3 m beam and a 3.2-metre draft. She's on record as U.S. official number 263376. SJT 4 belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.

Free forever · No credit card · for commercial operators

Eyes on SJT 4, 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 SJT 4 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 SJT 4 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 SJT 4 and switch it all on

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Claim free → unlock everything

About SJT 4

What kind of vessel is SJT 4?

SJT 4 is a Tank Barge flagged to United States of America.

What is SJT 4's U.S. Official No.?

SJT 4's U.S. Official No. is 263376.

How big is SJT 4?

SJT 4 is about 80.8 m long, 15.3 m on the beam, drawing 3.2 m.

Is SJT 4 on the Master's Mate Safety Initiative Network?

Not yet. If SJT 4 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).