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 (Inspected)
THRESHER
MMSI 366406000 · Call sign WDH4076
Not yet on Master's MateType
Passenger (Inspected)
Flag
USALength
58.5 m
Beam
13.7 m
Draft
5.7 m
Call sign
WDH4076
Official No.
980979
AIS reports
2
An American passenger ferry, THRESHER measures 58.5 metres. Below, she has a 13.7 m beam and a draft of 5.7 m. She's on record as MMSI 366406000, call sign WDH4076. It's free to add THRESHER to the Master's Mate Safety Initiative Network — like AAA for the ocean, run by the cruisers who use it.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard THRESHER 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 THRESHER 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 THRESHER 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 THRESHER and switch it all on
Free to join · nothing to install to start · cancel anytime
About THRESHER
What kind of vessel is THRESHER?
THRESHER is a Passenger (Inspected) flagged to United States of America.
What is THRESHER's MMSI?
THRESHER's MMSI is 366406000. Call sign WDH4076.
How big is THRESHER?
THRESHER is about 58.5 m long, 13.7 m on the beam, drawing 5.7 m.
Is THRESHER on the Master's Mate Safety Initiative Network?
Not yet. If THRESHER is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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