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.
Passenger (Inspected)
Mariner
MMSI 366218000 · Call sign WDP4211
Not yet on Master's MateType
Passenger (Inspected)
Flag
USALength
19.7 m
Beam
5.3 m
Draft
2.7 m
Call sign
WDP4211
Official No.
976145
Hull ID
DYD65701F090
AIS reports
2
Mariner is an American ferry, 19.7 metres overall. Mariner has 5.3 metres in the beam and a 2.7-metre draft. Her papers read MMSI 366218000, call sign WDP4211. Mariner carries passengers; the free Master's Mate Safety Initiative Network helps carry the watch, with distress alerting and a network nearby.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard Mariner safe.
Distress alerting, live AIS, onboard monitoring and weather routing — the safety stack for boats that carry people.
Switch on the safety stack — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Mariner 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 passenger & charter operators
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Mariner on the map. It hands you the full bridge:
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim Mariner and switch it all on
Free to join · nothing to install to start · cancel anytime
About Mariner
What kind of vessel is Mariner?
Mariner is a Passenger (Inspected) flagged to United States of America.
What is Mariner's MMSI?
Mariner's MMSI is 366218000. Call sign WDP4211.
How big is Mariner?
Mariner is about 19.7 m long, 5.3 m on the beam, drawing 2.7 m.
Is Mariner on the Master's Mate Safety Initiative Network?
Not yet. If Mariner is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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