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

Seiei Maru

MMSI 431401143

Not yet on Master's Mate

Flag

JPN

Length

111 m

IMO

9033012

AIS reports

Seiei Maru flies the Japanese flag — an 111-metre vessel. Her papers read MMSI 431401143, IMO 9033012. Claim Seiei Maru free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.

Free forever · No credit card

Is Seiei 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 Seiei 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 Seiei 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 Seiei Maru and switch it all on

Free to join · nothing to install to start · cancel anytime

Claim free → unlock everything

About Seiei Maru

What kind of vessel is Seiei Maru?

Seiei Maru is a vessel flagged to Japan.

What is Seiei Maru's MMSI?

Seiei Maru's MMSI is 431401143. IMO 9033012.

How big is Seiei Maru?

Seiei Maru is about 111 m long.

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

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