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.

Offshore Supply Vessel

Mr. Sonny

MMSI 366818330 · Call sign WDA5271

Not yet on Master's Mate

Type

Offshore Supply Vessel

Flag

USA

Length

46.9 m

Beam

12.2 m

Draft

4 m

Call sign

WDA5271

IMO

8033584

Official No.

616274

AIS reports

Mr. Sonny is an American utility vessel — 46.9 metres overall. Mr. Sonny has a 12.2 m beam and a 4-metre draft. On AIS she appears as MMSI 366818330, call sign WDA5271, IMO 8033584. Mr. Sonny is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.

Free forever · No credit card · for working boats

Built for boats that work — like Mr. Sonny.

Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.

Rig her out — free →

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

Wherever Mr. Sonny 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 · for working boats

The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put Mr. Sonny on the map. It hands you the full bridge:

Systems Monitoring

Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.

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.

Distress Mesh

Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.

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.

Onboard Cameras

Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.

Hail Any Captain

A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.

Claim Mr. Sonny and switch it all on

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

Claim free → unlock everything

About Mr. Sonny

What kind of vessel is Mr. Sonny?

Mr. Sonny is a Offshore Supply Vessel flagged to United States of America.

What is Mr. Sonny's MMSI?

Mr. Sonny's MMSI is 366818330. Call sign WDA5271. IMO 8033584.

How big is Mr. Sonny?

Mr. Sonny is about 46.9 m long, 12.2 m on the beam, drawing 4 m.

Is Mr. Sonny on the Master's Mate Safety Initiative Network?

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