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

Natsushima

MMSI 431129000

Not yet on Master's Mate

Flag

JPN

Length

67 m

IMO

7819785

AIS reports

Natsushima, a craft flying the Japanese flag, measures 67 metres on deck. On AIS she shows as MMSI 431129000, IMO 7819785. Natsushima can be part of the Master's Mate Safety Initiative Network at no cost — a community watch that never sleeps.

Free forever · No credit card

Is Natsushima 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 Natsushima 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 Natsushima 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 Natsushima and switch it all on

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Claim free → unlock everything

About Natsushima

What kind of vessel is Natsushima?

Natsushima is a vessel flagged to Japan.

What is Natsushima's MMSI?

Natsushima's MMSI is 431129000. IMO 7819785.

How big is Natsushima?

Natsushima is about 67 m long.

Is Natsushima on the Master's Mate Safety Initiative Network?

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