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

UC 104

U.S. Official No. 644594

Not yet on Master's Mate

Type

Tank Barge

Flag

USA

Length

33.5 m

Beam

9.1 m

Draft

1.7 m

First reported

Jun 2026

AIS reports

UC 104, a tank ship under the American flag, measures 33.5 metres on deck. UC 104 has 9.1 metres in the beam and a 1.7-metre draft. She's on record as U.S. official number 644594. Join UC 104 to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.

Free forever · No credit card · for commercial operators

Eyes on UC 104, 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 UC 104 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 UC 104 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 UC 104 and switch it all on

Free to join · nothing to install to start · cancel anytime

Claim free → unlock everything

About UC 104

What kind of vessel is UC 104?

UC 104 is a Tank Barge flagged to United States of America.

What is UC 104's U.S. Official No.?

UC 104's U.S. Official No. is 644594.

How big is UC 104?

UC 104 is about 33.5 m long, 9.1 m on the beam, drawing 1.7 m.

Is UC 104 on the Master's Mate Safety Initiative Network?

Not yet. If UC 104 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).