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
OR 4781
U.S. Official No. 938711
Not yet on Master's MateType
Freight Barge
Flag
USALength
59.4 m
Beam
10.7 m
Draft
3.7 m
First reported
Jun 2026
AIS reports
1
OR 4781 flies the American flag — a 59.4-metre freight barge. OR 4781 has 10.7 metres in the beam and a 3.7-metre draft. She's listed under U.S. official number 938711. Big or small, every hull benefits from the free Master's Mate Safety Initiative Network — OR 4781 included.
Free forever · No credit card · for commercial operators
Eyes on OR 4781, 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 OR 4781 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 OR 4781 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 OR 4781 and switch it all on
Free to join · nothing to install to start · cancel anytime
About OR 4781
What kind of vessel is OR 4781?
OR 4781 is a Freight Barge flagged to United States of America.
What is OR 4781's U.S. Official No.?
OR 4781's U.S. Official No. is 938711.
How big is OR 4781?
OR 4781 is about 59.4 m long, 10.7 m on the beam, drawing 3.7 m.
Is OR 4781 on the Master's Mate Safety Initiative Network?
Not yet. If OR 4781 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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