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

Ryouken Maru

MMSI 431004876

Not yet on Master's Mate

Flag

JPN

Length

53 m

IMO

9677193

AIS reports

Registered in Japan, Ryouken Maru is a 53-metre boat. She's on record as MMSI 431004876, IMO 9677193. Add Ryouken Maru to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.

Free forever · No credit card

Is Ryouken Maru 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 Ryouken Maru 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 Ryouken Maru 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 Ryouken Maru and switch it all on

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Claim free → unlock everything

About Ryouken Maru

What kind of vessel is Ryouken Maru?

Ryouken Maru is a vessel flagged to Japan.

What is Ryouken Maru's MMSI?

Ryouken Maru's MMSI is 431004876. IMO 9677193.

How big is Ryouken Maru?

Ryouken Maru is about 53 m long.

Is Ryouken Maru on the Master's Mate Safety Initiative Network?

Not yet. If Ryouken Maru is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).