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

Double M

MMSI 366938460 · Call sign WDB7215

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

16.7 m

Beam

6.4 m

Draft

1.7 m

Call sign

WDB7215

Official No.

578764

AIS reports

Double M is a service vessel flying the flag of the United States, measuring 16.7 metres. Double M has a 6.4 m beam and a 1.7 m draft. Find her under MMSI 366938460, call sign WDB7215. Join Double M to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.

Free forever · No credit card · for working boats

Built for boats that work — like Double M.

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 Double M 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 Double M 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 Double M and switch it all on

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

Claim free → unlock everything

About Double M

What kind of vessel is Double M?

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

What is Double M's MMSI?

Double M's MMSI is 366938460. Call sign WDB7215.

How big is Double M?

Double M is about 16.7 m long, 6.4 m on the beam, drawing 1.7 m.

Is Double M on the Master's Mate Safety Initiative Network?

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