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

JB 50B

U.S. Official No. 540365

Not yet on Master's Mate

Type

Freight Barge

Flag

USA

Length

61 m

Beam

10.7 m

Draft

3.4 m

First reported

Jun 2026

AIS reports

Registered in the United States, JB 50B is a 61-metre freight barge. Below, she has 10.7 metres in the beam and a draft measuring 3.4 metres. On the registers she's U.S. official number 540365. Claim JB 50B free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.

Free forever · No credit card · for commercial operators

Eyes on JB 50B, 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 JB 50B 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 JB 50B 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 JB 50B and switch it all on

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

Claim free → unlock everything

About JB 50B

What kind of vessel is JB 50B?

JB 50B is a Freight Barge flagged to United States of America.

What is JB 50B's U.S. Official No.?

JB 50B's U.S. Official No. is 540365.

How big is JB 50B?

JB 50B is about 61 m long, 10.7 m on the beam, drawing 3.4 m.

Is JB 50B on the Master's Mate Safety Initiative Network?

Not yet. If JB 50B is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).