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

HARBOR CAPTAIN

MMSI 366892140 · Call sign WDB3863

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

12.8 m

Beam

5.5 m

Draft

2.4 m

Call sign

WDB3863

Official No.

1043519

AIS reports

HARBOR CAPTAIN, an utility vessel sailing under the American flag, measures 12.8 metres on deck. She's built with a beam measuring 5.5 metres and a 2.4-metre draft. She's on record as MMSI 366892140, call sign WDB3863. HARBOR CAPTAIN can be part of the Master's Mate Safety Initiative Network at no cost — a community watch that never sleeps.

Free forever · No credit card · for working boats

Built for boats that work — like HARBOR CAPTAIN.

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 HARBOR CAPTAIN 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 HARBOR CAPTAIN 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 HARBOR CAPTAIN and switch it all on

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

Claim free → unlock everything

About HARBOR CAPTAIN

What kind of vessel is HARBOR CAPTAIN?

HARBOR CAPTAIN is a Towing Vessel flagged to United States of America.

What is HARBOR CAPTAIN's MMSI?

HARBOR CAPTAIN's MMSI is 366892140. Call sign WDB3863.

How big is HARBOR CAPTAIN?

HARBOR CAPTAIN is about 12.8 m long, 5.5 m on the beam, drawing 2.4 m.

Is HARBOR CAPTAIN on the Master's Mate Safety Initiative Network?

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