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

Riesenhai

MMSI 211420520

Not yet on Master's Mate

Flag

DEU

Length

26.5 m

IMO

5294759

AIS reports

Out of Germany, Riesenhai is a 26.5-metre vessel. She's listed under MMSI 211420520, IMO 5294759. Claim Riesenhai free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.

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Is Riesenhai 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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Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers

Wherever Riesenhai 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 Riesenhai 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 Riesenhai and switch it all on

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About Riesenhai

What kind of vessel is Riesenhai?

Riesenhai is a vessel flagged to Germany.

What is Riesenhai's MMSI?

Riesenhai's MMSI is 211420520. IMO 5294759.

How big is Riesenhai?

Riesenhai is about 26.5 m long.

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

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