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

Tempest Sentinel

MMSI 538006553

Not yet on Master's Mate

Flag

MHL

Length

78 m

IMO

9774159

AIS reports

Tempest Sentinel, a vessel flying the flag of the Marshall Islands, measures 78 metres on deck. Her papers read MMSI 538006553, IMO 9774159. Sign Tempest Sentinel up free to the Master's Mate Safety Initiative Network and join a fleet that looks after its own.

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Is Tempest Sentinel 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 Tempest Sentinel 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 Tempest Sentinel 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 Tempest Sentinel and switch it all on

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About Tempest Sentinel

What kind of vessel is Tempest Sentinel?

Tempest Sentinel is a vessel flagged to Marshall Islands.

What is Tempest Sentinel's MMSI?

Tempest Sentinel's MMSI is 538006553. IMO 9774159.

How big is Tempest Sentinel?

Tempest Sentinel is about 78 m long.

Is Tempest Sentinel on the Master's Mate Safety Initiative Network?

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