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.
Offshore Supply Vessel
HOS BLACK WATCH
MMSI 367612330 · Call sign WDH3922
Not yet on Master's MateType
Offshore Supply Vessel
Flag
USALength
84.9 m
Beam
19.5 m
Draft
7.9 m
Call sign
WDH3922
IMO
9647710
Official No.
1244581
AIS reports
1
On the American registry, HOS BLACK WATCH is an 84.9-metre workboat. She carries a beam measuring 19.5 metres and a 7.9 m draft. She broadcasts as MMSI 367612330, call sign WDH3922, IMO 9647710. HOS BLACK WATCH earns her keep on the water; the free Master's Mate Safety Initiative Network keeps a watching fleet and a distress mesh close at hand.
Free forever · No credit card · for working boats
Built for boats that work — like HOS BLACK WATCH.
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 HOS BLACK WATCH 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 HOS BLACK WATCH 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 HOS BLACK WATCH and switch it all on
Free to join · nothing to install to start · cancel anytime
About HOS BLACK WATCH
What kind of vessel is HOS BLACK WATCH?
HOS BLACK WATCH is a Offshore Supply Vessel flagged to United States of America.
What is HOS BLACK WATCH's MMSI?
HOS BLACK WATCH's MMSI is 367612330. Call sign WDH3922. IMO 9647710.
How big is HOS BLACK WATCH?
HOS BLACK WATCH is about 84.9 m long, 19.5 m on the beam, drawing 7.9 m.
Is HOS BLACK WATCH on the Master's Mate Safety Initiative Network?
Not yet. If HOS BLACK WATCH is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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