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 Ship
RF 439B
U.S. Official No. 1176511
Not yet on Master's MateType
Freight Ship
Flag
USALength
61 m
Beam
10.7 m
Draft
4 m
First reported
Jun 2026
AIS reports
1
On the American registry, RF 439B is a 61-metre cargo ship. She's built with 10.7 metres in the beam and a 4 m draft. Look for U.S. official number 1176511. Put RF 439B on the Master's Mate Safety Initiative Network — free to claim, with a whole fleet watching out for her.
Free forever · No credit card · for commercial operators
Eyes on RF 439B, 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 RF 439B 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 RF 439B 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 RF 439B and switch it all on
Free to join · nothing to install to start · cancel anytime
About RF 439B
What kind of vessel is RF 439B?
RF 439B is a Freight Ship flagged to United States of America.
What is RF 439B's U.S. Official No.?
RF 439B's U.S. Official No. is 1176511.
How big is RF 439B?
RF 439B is about 61 m long, 10.7 m on the beam, drawing 4 m.
Is RF 439B on the Master's Mate Safety Initiative Network?
Not yet. If RF 439B is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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