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
Alpha Leonis
MMSI 366814390 · Call sign WDA4904
Not yet on Master's MateType
Recreational
Flag
USALength
11.8 m
Beam
4 m
Draft
1.9 m
Call sign
WDA4904
Official No.
1110681
Hull ID
TDL38105L001
AIS reports
1
Alpha Leonis, a recreational vessel flagged in the United States, measures 11.8 metres on deck. She has a 4 m beam and a draft of 1.9 m. On AIS she shows as MMSI 366814390, call sign WDA4904. Alpha Leonis can be part of the Master's Mate Safety Initiative Network at no cost — a community watch that never sleeps.
Free forever · No credit card · for recreational captains
Keep Alpha Leonis 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 Alpha Leonis 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 Alpha Leonis 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 Alpha Leonis and switch it all on
Free to join · nothing to install to start · cancel anytime
About Alpha Leonis
What kind of vessel is Alpha Leonis?
Alpha Leonis is a Recreational flagged to United States of America.
What is Alpha Leonis's MMSI?
Alpha Leonis's MMSI is 366814390. Call sign WDA4904.
How big is Alpha Leonis?
Alpha Leonis is about 11.8 m long, 4 m on the beam, drawing 1.9 m.
Is Alpha Leonis on the Master's Mate Safety Initiative Network?
Not yet. If Alpha Leonis 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.