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.
Cargo
ARC DEFENDER
MMSI 338145000 · Call sign WDM6793
Not yet on Master's MateType
Cargo
Flag
USALength
200 m
Beam
32 m
Draft
9.5 m
Call sign
WDM6793
IMO
9375264
Official No.
917495
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
37
ARC DEFENDER, a cargo vessel on the the United States registry, measures 200 metres on deck. She's built with a beam measuring 32 metres and a 9.5-metre draft. Find her under MMSI 338145000, call sign WDM6793, IMO 9375264. ARC DEFENDER can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.
Free forever · No credit card · for commercial operators
Eyes on ARC DEFENDER, around the clock.
Real-time AIS, full systems telemetry, distress alerting and worldwide charts — your hull on one dashboard, from anywhere.
Put her on the dashboard — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Live AIS position · Jun 9, 2026 11:16 UTC
Position
39.2409° N, 76.5349° W
Status
Moored
Speed
0.0 kn
Course
134°
Destination
USBPT>USBAL
ETA
06-08 12:00 UTC
Transiting Chesapeake 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 commercial operators
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put ARC DEFENDER on the map. It hands you the full bridge:
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.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
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 ARC DEFENDER and switch it all on
Free to join · nothing to install to start · cancel anytime
About ARC DEFENDER
What kind of vessel is ARC DEFENDER?
ARC DEFENDER is a Cargo flagged to United States of America.
Where was ARC DEFENDER last seen?
ARC DEFENDER was last reported in Chesapeake Bay in Jun 2026 on public AIS.
What is ARC DEFENDER's MMSI?
ARC DEFENDER's MMSI is 338145000. Call sign WDM6793. IMO 9375264.
How big is ARC DEFENDER?
ARC DEFENDER is about 200 m long, 32 m on the beam, drawing 9.5 m.
Is ARC DEFENDER on the Master's Mate Safety Initiative Network?
Not yet. If ARC DEFENDER is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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