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)
Mark Twain
MMSI 366969860 · Call sign WDB9108
Not yet on Master's MateType
Passenger (Inspected)
Flag
USALength
27.8 m
Beam
8.1 m
Draft
1.5 m
Call sign
WDB9108
Official No.
296555
AIS reports
1
Mark Twain, an American ferry vessel, measures 27.8 metres on deck. She has 8.1 metres in the beam and a draft of 1.5 m. Find her under MMSI 366969860, call sign WDB9108. It's free to add Mark Twain 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 Mark Twain 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 Mark Twain 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 Mark Twain 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 Mark Twain and switch it all on
Free to join · nothing to install to start · cancel anytime
About Mark Twain
What kind of vessel is Mark Twain?
Mark Twain is a Passenger (Inspected) flagged to United States of America.
What is Mark Twain's MMSI?
Mark Twain's MMSI is 366969860. Call sign WDB9108.
How big is Mark Twain?
Mark Twain is about 27.8 m long, 8.1 m on the beam, drawing 1.5 m.
Is Mark Twain on the Master's Mate Safety Initiative Network?
Not yet. If Mark Twain is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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