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.
Research Vessel
Theory
MMSI 368178390 · Call sign WDL9365
Not yet on Master's MateType
Research Vessel
Flag
USALength
12.3 m
Beam
4.1 m
Draft
2.1 m
Call sign
WDL9365
Official No.
1217549
Hull ID
IAR34CATA808
AIS reports
1
Theory is an American boat — 12.3 metres overall. Theory has 4.1 metres in the beam and a 2.1 m draft. She's on record as MMSI 368178390, call sign WDL9365. Give Theory the backing of the Master's Mate Safety Initiative Network — free, and a fleet that has her back.
Free forever · No credit card
Is Theory your boat?
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Theory 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
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Theory 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.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
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 Theory and switch it all on
Free to join · nothing to install to start · cancel anytime
About Theory
What kind of vessel is Theory?
Theory is a Research Vessel flagged to United States of America.
What is Theory's MMSI?
Theory's MMSI is 368178390. Call sign WDL9365.
How big is Theory?
Theory is about 12.3 m long, 4.1 m on the beam, drawing 2.1 m.
Is Theory on the Master's Mate Safety Initiative Network?
Not yet. If Theory is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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