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.

Freight Barge

GC-104

U.S. Official No. 523821

Not yet on Master's Mate

Type

Freight Barge

Flag

USA

Length

50 m

Beam

15.3 m

Draft

3.1 m

First reported

Jun 2026

AIS reports

GC-104 is an American barge — 50 metres overall. She has a beam of 15.3 m and a draft of 3.1 m. Officially she's U.S. official number 523821. Add GC-104 to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.

Free forever · No credit card · for commercial operators

Eyes on GC-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 GC-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 GC-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 GC-104 and switch it all on

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

Claim free → unlock everything

About GC-104

What kind of vessel is GC-104?

GC-104 is a Freight Barge flagged to United States of America.

What is GC-104's U.S. Official No.?

GC-104's U.S. Official No. is 523821.

How big is GC-104?

GC-104 is about 50 m long, 15.3 m on the beam, drawing 3.1 m.

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

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