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

BTU Special

MMSI 367703020 · Call sign WDI4881

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

14.4 m

Beam

5.7 m

Draft

2 m

Call sign

WDI4881

Official No.

572552

AIS reports

BTU Special flies the American flag — a 14.4-metre working craft. She has a 5.7-metre beam and a draft of 2 m. On AIS she shows as MMSI 367703020, call sign WDI4881. BTU Special 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 BTU Special.

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 BTU Special 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 BTU Special 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 BTU Special and switch it all on

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

Claim free → unlock everything

About BTU Special

What kind of vessel is BTU Special?

BTU Special is a Towing Vessel flagged to United States of America.

What is BTU Special's MMSI?

BTU Special's MMSI is 367703020. Call sign WDI4881.

How big is BTU Special?

BTU Special is about 14.4 m long, 5.7 m on the beam, drawing 2 m.

Is BTU Special on the Master's Mate Safety Initiative Network?

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