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.

Passenger (Uninspected)

THUNNUS

MMSI 366604150 · Call sign WCI4201

Not yet on Master's Mate

Type

Passenger (Uninspected)

Flag

USA

Length

14.8 m

Beam

4.9 m

Draft

2.1 m

Call sign

WCI4201

Official No.

698660

Hull ID

VKY48438C686

AIS reports

On the American registry, THUNNUS is a 14.8-metre passenger ship. Her hull carries a beam of 4.9 m and a draft measuring 2.1 metres. She's listed under MMSI 366604150, call sign WCI4201. THUNNUS can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.

Free forever · No credit card · for passenger & charter operators

Keep every soul aboard THUNNUS safe.

Distress alerting, live AIS, onboard monitoring and weather routing — the safety stack for boats that carry people.

Switch on the safety stack — free →

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

Wherever THUNNUS 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 passenger & charter operators

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

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

Distress Mesh

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

Live AIS & Traffic

See every vessel around you in real time. Closest-approach warnings before they matter.

Systems Monitoring

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

Weather & Routing

GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.

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 THUNNUS and switch it all on

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

Claim free → unlock everything

About THUNNUS

What kind of vessel is THUNNUS?

THUNNUS is a Passenger (Uninspected) flagged to United States of America.

What is THUNNUS's MMSI?

THUNNUS's MMSI is 366604150. Call sign WCI4201.

How big is THUNNUS?

THUNNUS is about 14.8 m long, 4.9 m on the beam, drawing 2.1 m.

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

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