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 M. Mack

MMSI 366966520 · Call sign WDB8922

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

54.9 m

Beam

15.8 m

Draft

3.4 m

Call sign

WDB8922

Official No.

565154

AIS reports

Harry M. Mack is an American 54.9-metre workboat. She carries a 15.8-metre beam and a 3.4 m draft. On AIS she shows as MMSI 366966520, call sign WDB8922. Harry M. Mack is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.

Free forever · No credit card · for working boats

Built for boats that work — like Harry M. Mack.

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 M. Mack 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 M. Mack 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 M. Mack and switch it all on

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

Claim free → unlock everything

About Harry M. Mack

What kind of vessel is Harry M. Mack?

Harry M. Mack is a Towing Vessel flagged to United States of America.

What is Harry M. Mack's MMSI?

Harry M. Mack's MMSI is 366966520. Call sign WDB8922.

How big is Harry M. Mack?

Harry M. Mack is about 54.9 m long, 15.8 m on the beam, drawing 3.4 m.

Is Harry M. Mack on the Master's Mate Safety Initiative Network?

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