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
Naniwa Maru No. 21
MMSI 431301595
Not yet on Master's MateFlag
JPNLength
70 m
IMO
9254367
AIS reports
2
Naniwa Maru No. 21 is a Japanese 70-metre boat. Look for MMSI 431301595, IMO 9254367. Add Naniwa Maru No. 21 to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.
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Is Naniwa Maru No. 21 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 Naniwa Maru No. 21 roams, you're never out there alone.
Thousands of cruisers on the Master's Mate Network — ready to help the moment something goes wrong.
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The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Naniwa Maru No. 21 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 Naniwa Maru No. 21 and switch it all on
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About Naniwa Maru No. 21
What kind of vessel is Naniwa Maru No. 21?
Naniwa Maru No. 21 is a vessel flagged to Japan.
What is Naniwa Maru No. 21's MMSI?
Naniwa Maru No. 21's MMSI is 431301595. IMO 9254367.
How big is Naniwa Maru No. 21?
Naniwa Maru No. 21 is about 70 m long.
Is Naniwa Maru No. 21 on the Master's Mate Safety Initiative Network?
Not yet. If Naniwa Maru No. 21 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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