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.
Towing Vessel
Harry J Brock
MMSI 367190050 · Call sign WDD7704
Not yet on Master's MateType
Towing Vessel
Flag
USALength
43.8 m
Beam
9 m
Draft
3.1 m
Call sign
WDD7704
Official No.
293607
AIS reports
1
Registered in the United States, Harry J Brock is a 43.8-metre harbour workboat. Below, she has a beam of 9 m and a draft of 3.1 m. Officially she's MMSI 367190050, call sign WDD7704. Claim Harry J Brock free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.
Free forever · No credit card · for working boats
Built for boats that work — like Harry J Brock.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Harry J Brock 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 working boats
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Harry J Brock on the map. It hands you the full bridge:
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.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
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 Harry J Brock and switch it all on
Free to join · nothing to install to start · cancel anytime
About Harry J Brock
What kind of vessel is Harry J Brock?
Harry J Brock is a Towing Vessel flagged to United States of America.
What is Harry J Brock's MMSI?
Harry J Brock's MMSI is 367190050. Call sign WDD7704.
How big is Harry J Brock?
Harry J Brock is about 43.8 m long, 9 m on the beam, drawing 3.1 m.
Is Harry J Brock on the Master's Mate Safety Initiative Network?
Not yet. If Harry J Brock is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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