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
THALASSA
MMSI 367506190 · Call sign WDF9539
Not yet on Master's MateType
Recreational
Flag
USALength
15.1 m
Beam
4.5 m
Draft
2.9 m
Call sign
WDF9539
Official No.
1205656
Hull ID
BEYN8045E707
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
86
An American pleasure craft, THALASSA measures 15.1 metres. THALASSA has a beam of 4.5 m and a 2.9-metre draft. Look for MMSI 367506190, call sign WDF9539. Sign THALASSA 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 recreational captains
Keep THALASSA 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
Live AIS position · Jun 9, 2026 15:09 UTC
Position
33.7243° N, 118.2815° W
Status
Under way (engine)
Speed
0.0 kn
Course
356°
Cruising off Southern California? 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 THALASSA 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 THALASSA and switch it all on
Free to join · nothing to install to start · cancel anytime
About THALASSA
What kind of vessel is THALASSA?
THALASSA is a Recreational flagged to United States of America.
Where was THALASSA last seen?
THALASSA was last reported in off Southern California in Jun 2026 on public AIS.
What is THALASSA's MMSI?
THALASSA's MMSI is 367506190. Call sign WDF9539.
How big is THALASSA?
THALASSA is about 15.1 m long, 4.5 m on the beam, drawing 2.9 m.
Is THALASSA on the Master's Mate Safety Initiative Network?
Not yet. If THALASSA is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.