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.
Pleasure Craft
DEFIANCE
MMSI 367108460 · Call sign WDC9922
Not yet on Master's MateType
Pleasure Craft
Flag
USALength
27 m
Beam
6 m
Draft
3 m
Call sign
WDC9922
Official No.
542720
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
79
DEFIANCE, an American private cruiser, measures 27 metres on deck. Her hull carries a 6 m beam and a draft measuring 3 metres. Look for MMSI 367108460, call sign WDC9922. There's a place for DEFIANCE on the Master's Mate Safety Initiative Network — free, community-driven, like AAA for the ocean.
Free forever · No credit card · for recreational captains
Keep DEFIANCE 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 02:48 UTC
Position
37.8581° N, 122.4808° W
Speed
0.0 kn
Course
291°
Cruising San Francisco Bay? 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 DEFIANCE 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 DEFIANCE and switch it all on
Free to join · nothing to install to start · cancel anytime
About DEFIANCE
What kind of vessel is DEFIANCE?
DEFIANCE is a Pleasure Craft flagged to United States of America.
Where was DEFIANCE last seen?
DEFIANCE was last reported in San Francisco Bay in Jun 2026 on public AIS.
What is DEFIANCE's MMSI?
DEFIANCE's MMSI is 367108460. Call sign WDC9922.
How big is DEFIANCE?
DEFIANCE is about 27 m long, 6 m on the beam, drawing 3 m.
Is DEFIANCE on the Master's Mate Safety Initiative Network?
Not yet. If DEFIANCE is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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