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

RYUOH

last seen 35°N 140°E · Jun 2026 · MMSI 431027405

Not yet on Master's Mate

First reported

Jun 2026

Last reported

Jun 2026

AIS reports

RYUOH is a boat. Her papers read MMSI 431027405. It's free to add RYUOH to the Master's Mate Safety Initiative Network — like AAA for the ocean, run by the cruisers who use it.

Photos of RYUOH

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Is RYUOH 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.

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Live AIS position · Jun 16, 2026 13:38 UTC

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Position

35.3923° N, 139.7094° E

Status

Under way (engine)

Speed

11.7 kn

Course

208°

Crossing the Sea of Japan? 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 RYUOH 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 RYUOH and switch it all on

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About RYUOH

What kind of vessel is RYUOH?

RYUOH is a vessel.

Where was RYUOH last seen?

RYUOH was last reported in the Sea of Japan in Jun 2026 on public AIS.

What is RYUOH's MMSI?

RYUOH's MMSI is 431027405.

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

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