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)
The Big Flat Top
MMSI 367523220 · Call sign WDG3169
Not yet on Master's MateType
Passenger (Inspected)
Flag
USALength
12.2 m
Beam
4.6 m
Draft
0.9 m
Call sign
WDG3169
Official No.
1160765
Hull ID
GVQ00024G405
AIS reports
1
The Big Flat Top, an American ferry vessel, measures 12.2 metres on deck. She has a 4.6 m beam and a draft of 0.9 m. She's on record as MMSI 367523220, call sign WDG3169. Add The Big Flat Top to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard The Big Flat Top 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 The Big Flat Top 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 The Big Flat Top 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 The Big Flat Top and switch it all on
Free to join · nothing to install to start · cancel anytime
About The Big Flat Top
What kind of vessel is The Big Flat Top?
The Big Flat Top is a Passenger (Inspected) flagged to United States of America.
What is The Big Flat Top's MMSI?
The Big Flat Top's MMSI is 367523220. Call sign WDG3169.
How big is The Big Flat Top?
The Big Flat Top is about 12.2 m long, 4.6 m on the beam, drawing 0.9 m.
Is The Big Flat Top on the Master's Mate Safety Initiative Network?
Not yet. If The Big Flat Top is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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