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
A1A
MMSI 368281860 · Call sign WDN4536
Not yet on Master's MateType
Recreational
Flag
USALength
21.9 m
Beam
6.1 m
Draft
3.4 m
Call sign
WDN4536
Official No.
1324998
AIS reports
1
A1A is an American recreational boat, measuring 21.9 metres. She's built with 6.1 metres in the beam and a 3.4 m draft. She's listed under MMSI 368281860, call sign WDN4536. Give A1A the backing of the Master's Mate Safety Initiative Network — free, and a fleet that has her back.
Free forever · No credit card · for recreational captains
Keep A1A 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 A1A 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 A1A 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 A1A and switch it all on
Free to join · nothing to install to start · cancel anytime
About A1A
What kind of vessel is A1A?
A1A is a Recreational flagged to United States of America.
What is A1A's MMSI?
A1A's MMSI is 368281860. Call sign WDN4536.
How big is A1A?
A1A is about 21.9 m long, 6.1 m on the beam, drawing 3.4 m.
Is A1A on the Master's Mate Safety Initiative Network?
Not yet. If A1A is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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