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

Sonoma

MMSI 538004399

Not yet on Master's Mate

Flag

MHL

Length

179 m

IMO

9123520

AIS reports

Sonoma is a Marshall Islands 179-metre vessel. On AIS she appears as MMSI 538004399, IMO 9123520. Sonoma is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.

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Is Sonoma 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 Sonoma 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 Sonoma 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 Sonoma and switch it all on

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About Sonoma

What kind of vessel is Sonoma?

Sonoma is a vessel flagged to Marshall Islands.

What is Sonoma's MMSI?

Sonoma's MMSI is 538004399. IMO 9123520.

How big is Sonoma?

Sonoma is about 179 m long.

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

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