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.
Recreational
Tranquility Base
MMSI 367365470 · Call sign WDE5357
Not yet on Master's MateType
Recreational
Flag
USALength
12.1 m
Beam
6.4 m
Draft
2.1 m
Call sign
WDE5357
Official No.
1072006
Hull ID
MJJ40141F898
AIS reports
1
Registered in the United States, Tranquility Base is a 12.1-metre leisure boat. She's built with a 6.4-metre beam and a 2.1 m draft. She broadcasts as MMSI 367365470, call sign WDE5357. The Master's Mate Safety Initiative Network welcomes Tranquility Base — free to join, cruiser-run, and always on watch.
Free forever · No credit card · for recreational captains
Keep Tranquility Base looked after — even when you’re not aboard.
Anchor alarms that wake you, a live camera at the dock, and weather you can trust before every run.
Look after her — claim free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Tranquility 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 recreational captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Tranquility Base on the map. It hands you the full bridge:
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim Tranquility Base and switch it all on
Free to join · nothing to install to start · cancel anytime
About Tranquility Base
What kind of vessel is Tranquility Base?
Tranquility Base is a Recreational flagged to United States of America.
What is Tranquility Base's MMSI?
Tranquility Base's MMSI is 367365470. Call sign WDE5357.
How big is Tranquility Base?
Tranquility Base is about 12.1 m long, 6.4 m on the beam, drawing 2.1 m.
Is Tranquility Base on the Master's Mate Safety Initiative Network?
Not yet. If Tranquility Base is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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