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.
Vessel
Ocean Challenger
MMSI 544130120
Not yet on Master's MateFlag
NRULength
70 m
IMO
9517264
AIS reports
2
Ocean Challenger is a 70-metre vessel, flying the flag of Nauru. Her registration reads MMSI 544130120, IMO 9517264. It's free to add Ocean Challenger to the Master's Mate Safety Initiative Network — like AAA for the ocean, run by the cruisers who use it.
Free forever · No credit card
Is Ocean Challenger your boat?
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Ocean Challenger 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
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Ocean Challenger on the map. It hands you the full bridge:
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
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.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim Ocean Challenger and switch it all on
Free to join · nothing to install to start · cancel anytime
About Ocean Challenger
What kind of vessel is Ocean Challenger?
Ocean Challenger is a vessel flagged to Nauru.
What is Ocean Challenger's MMSI?
Ocean Challenger's MMSI is 544130120. IMO 9517264.
How big is Ocean Challenger?
Ocean Challenger is about 70 m long.
Is Ocean Challenger on the Master's Mate Safety Initiative Network?
Not yet. If Ocean Challenger is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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