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
O Sea D
MMSI 367778270 · Call sign WDJ4500
Not yet on Master's MateType
Recreational
Flag
USALength
15.8 m
Beam
4.8 m
Draft
2.5 m
Call sign
WDJ4500
Official No.
1234958
Hull ID
SERY1684C010
AIS reports
1
O Sea D is a private vessel on the the United States registry, 15.8 metres LOA. She has a 4.8 m beam and a draft of 2.5 m. Her papers read MMSI 367778270, call sign WDJ4500. Put O Sea D on the Master's Mate Safety Initiative Network — free to claim, with a whole fleet watching out for her.
Free forever · No credit card · for recreational captains
Keep O Sea D 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 O Sea D 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 O Sea D 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 O Sea D and switch it all on
Free to join · nothing to install to start · cancel anytime
About O Sea D
What kind of vessel is O Sea D?
O Sea D is a Recreational flagged to United States of America.
What is O Sea D's MMSI?
O Sea D's MMSI is 367778270. Call sign WDJ4500.
How big is O Sea D?
O Sea D is about 15.8 m long, 4.8 m on the beam, drawing 2.5 m.
Is O Sea D on the Master's Mate Safety Initiative Network?
Not yet. If O Sea D 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.