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.

Industrial Vessel

HOS BLACK ROCK

MMSI 367612320 · Call sign WDH3921

Not yet on Master's Mate

Type

Industrial Vessel

Flag

USA

Length

84.9 m

Beam

19.5 m

Draft

7.9 m

Call sign

WDH3921

IMO

9647708

Official No.

1244583

AIS reports

HOS BLACK ROCK is an American cargo vessel, 84.9 metres in length. She's built with 19.5 metres in the beam and a 7.9 m draft. Find her under MMSI 367612320, call sign WDH3921, IMO 9647708. There's a place for HOS BLACK ROCK on the Master's Mate Safety Initiative Network — free, community-driven, like AAA for the ocean.

Free forever · No credit card · for commercial operators

Eyes on HOS BLACK ROCK, 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

Wherever HOS BLACK ROCK 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 commercial operators

The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put HOS BLACK ROCK 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 HOS BLACK ROCK and switch it all on

Free to join · nothing to install to start · cancel anytime

Claim free → unlock everything

About HOS BLACK ROCK

What kind of vessel is HOS BLACK ROCK?

HOS BLACK ROCK is a Industrial Vessel flagged to United States of America.

What is HOS BLACK ROCK's MMSI?

HOS BLACK ROCK's MMSI is 367612320. Call sign WDH3921. IMO 9647708.

How big is HOS BLACK ROCK?

HOS BLACK ROCK is about 84.9 m long, 19.5 m on the beam, drawing 7.9 m.

Is HOS BLACK ROCK on the Master's Mate Safety Initiative Network?

Not yet. If HOS BLACK ROCK is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).