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
Sumise Maru No. 21
MMSI 431001077
Not yet on Master's MateFlag
JPNLength
95 m
IMO
9511090
AIS reports
2
A Japanese craft, Sumise Maru No. 21 measures 95 metres. Look for MMSI 431001077, IMO 9511090. Sumise Maru No. 21 is welcome on the Master's Mate Safety Initiative Network — a free, community-run watch where boats look out for one another.
Free forever · No credit card
Is Sumise 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 Sumise 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.
Free with your claim
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Sumise 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 Sumise Maru No. 21 and switch it all on
Free to join · nothing to install to start · cancel anytime
About Sumise Maru No. 21
What kind of vessel is Sumise Maru No. 21?
Sumise Maru No. 21 is a vessel flagged to Japan.
What is Sumise Maru No. 21's MMSI?
Sumise Maru No. 21's MMSI is 431001077. IMO 9511090.
How big is Sumise Maru No. 21?
Sumise Maru No. 21 is about 95 m long.
Is Sumise Maru No. 21 on the Master's Mate Safety Initiative Network?
Not yet. If Sumise Maru No. 21 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.