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.
Towing Vessel
MARK C
MMSI 366961270 · Call sign WDB8591
Not yet on Master's MateType
Towing Vessel
Flag
USALength
24.7 m
Beam
7.9 m
Draft
2.8 m
Call sign
WDB8591
IMO
7237456
Official No.
543154
AIS reports
1
MARK C, an American utility boat, measures 24.7 metres on deck. She carries a beam measuring 7.9 metres and a 2.8-metre draft. On AIS she shows as MMSI 366961270, call sign WDB8591, IMO 7237456. MARK C is welcome on the Master's Mate Safety Initiative Network — a free, community-run watch where boats look out for one another.
Free forever · No credit card · for working boats
Built for boats that work — like MARK C.
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 MARK C 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 MARK C 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 MARK C and switch it all on
Free to join · nothing to install to start · cancel anytime
About MARK C
What kind of vessel is MARK C?
MARK C is a Towing Vessel flagged to United States of America.
What is MARK C's MMSI?
MARK C's MMSI is 366961270. Call sign WDB8591. IMO 7237456.
How big is MARK C?
MARK C is about 24.7 m long, 7.9 m on the beam, drawing 2.8 m.
Is MARK C on the Master's Mate Safety Initiative Network?
Not yet. If MARK C is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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