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

Kosyu Maru

MMSI 431005339

Not yet on Master's Mate

Flag

JPN

Length

104 m

IMO

9699232

AIS reports

Kosyu Maru, a Japanese vessel, measures 104 metres on deck. She broadcasts as MMSI 431005339, IMO 9699232. The Master's Mate Safety Initiative Network welcomes Kosyu Maru — free to join, cruiser-run, and always on watch.

Free forever · No credit card

Is Kosyu 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 Kosyu 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 Kosyu 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 Kosyu Maru and switch it all on

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About Kosyu Maru

What kind of vessel is Kosyu Maru?

Kosyu Maru is a vessel flagged to Japan.

What is Kosyu Maru's MMSI?

Kosyu Maru's MMSI is 431005339. IMO 9699232.

How big is Kosyu Maru?

Kosyu Maru is about 104 m long.

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

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