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)
Sea Base
MMSI 368247570 · Call sign WDM8902
Not yet on Master's MateType
Passenger (Uninspected)
Flag
USALength
18.3 m
Beam
5.3 m
Draft
2.7 m
Call sign
WDM8902
Official No.
1198061
Hull ID
GDGS6049D707
AIS reports
1
Sea Base flies the American flag — an 18.3-metre ferry vessel. Her hull carries a beam measuring 5.3 metres and a draft of 2.7 m. Find her under MMSI 368247570, call sign WDM8902. Sign Sea Base up free to the Master's Mate Safety Initiative Network and join a fleet that looks after its own.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard Sea Base 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 Sea Base 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 Sea Base 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 Sea Base and switch it all on
Free to join · nothing to install to start · cancel anytime
About Sea Base
What kind of vessel is Sea Base?
Sea Base is a Passenger (Uninspected) flagged to United States of America.
What is Sea Base's MMSI?
Sea Base's MMSI is 368247570. Call sign WDM8902.
How big is Sea Base?
Sea Base is about 18.3 m long, 5.3 m on the beam, drawing 2.7 m.
Is Sea Base on the Master's Mate Safety Initiative Network?
Not yet. If Sea Base is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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