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

Heidi

MMSI 367080730 · Call sign WDI7556

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

18.6 m

Beam

6.6 m

Draft

2 m

Call sign

WDI7556

Official No.

500868

AIS reports

Heidi, an utility boat flagged in the United States, measures 18.6 metres on deck. She's built with 6.6 metres in the beam and a 2-metre draft. On AIS she shows as MMSI 367080730, call sign WDI7556. Put Heidi on the free Master's Mate Safety Initiative Network and keep the working fleet looking out for each other.

Free forever · No credit card · for working boats

Built for boats that work — like Heidi.

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 Heidi 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 Heidi 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 Heidi and switch it all on

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

Claim free → unlock everything

About Heidi

What kind of vessel is Heidi?

Heidi is a Towing Vessel flagged to United States of America.

What is Heidi's MMSI?

Heidi's MMSI is 367080730. Call sign WDI7556.

How big is Heidi?

Heidi is about 18.6 m long, 6.6 m on the beam, drawing 2 m.

Is Heidi on the Master's Mate Safety Initiative Network?

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