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)
tuna thumper
MMSI 366902880 · Call sign WCU4535
Not yet on Master's MateType
Passenger (Uninspected)
Flag
USALength
12.2 m
Beam
4.4 m
Draft
2.1 m
Call sign
WCU4535
Official No.
595495
AIS reports
1
An American passenger ferry, tuna thumper measures 12.2 metres. She has a beam of 4.4 m and a draft of 2.1 m. On the registers she's MMSI 366902880, call sign WCU4535. tuna thumper belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard tuna thumper 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 tuna thumper 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 tuna thumper 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 tuna thumper and switch it all on
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About tuna thumper
What kind of vessel is tuna thumper?
tuna thumper is a Passenger (Uninspected) flagged to United States of America.
What is tuna thumper's MMSI?
tuna thumper's MMSI is 366902880. Call sign WCU4535.
How big is tuna thumper?
tuna thumper is about 12.2 m long, 4.4 m on the beam, drawing 2.1 m.
Is tuna thumper on the Master's Mate Safety Initiative Network?
Not yet. If tuna thumper is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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