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)
Top Shelf
MMSI 366890680 · Call sign WDB3731
Not yet on Master's MateType
Passenger (Uninspected)
Flag
USALength
13.4 m
Beam
4.5 m
Draft
2.1 m
Call sign
WDB3731
Official No.
922022
Hull ID
HEB04020D787
AIS reports
1
Top Shelf, a ferry sailing under the American flag, measures 13.4 metres on deck. Top Shelf has a beam of 4.5 m and a 2.1-metre draft. Her registration reads MMSI 366890680, call sign WDB3731. Keep every soul aboard Top Shelf covered with the free Master's Mate Safety Initiative Network.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard Top Shelf 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 Top Shelf 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 Top Shelf 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 Top Shelf and switch it all on
Free to join · nothing to install to start · cancel anytime
About Top Shelf
What kind of vessel is Top Shelf?
Top Shelf is a Passenger (Uninspected) flagged to United States of America.
What is Top Shelf's MMSI?
Top Shelf's MMSI is 366890680. Call sign WDB3731.
How big is Top Shelf?
Top Shelf is about 13.4 m long, 4.5 m on the beam, drawing 2.1 m.
Is Top Shelf on the Master's Mate Safety Initiative Network?
Not yet. If Top Shelf is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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