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.

Recreational

Principia

MMSI 367640890 · Call sign WDH6712

Not yet on Master's Mate

Type

Recreational

Flag

USA

Length

11.6 m

Beam

3.8 m

Draft

1.5 m

Call sign

WDH6712

Official No.

699742

AIS reports

Principia is a pleasure boat flagged in the United States, 11.6 metres LOA. Below, she has 3.8 metres in the beam and a draft of 1.5 m. On AIS she appears as MMSI 367640890, call sign WDH6712. Claim Principia free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.

Free forever · No credit card · for recreational captains

Keep Principia looked after — even when you’re not aboard.

Anchor alarms that wake you, a live camera at the dock, and weather you can trust before every run.

Look after her — claim free →

Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers

Wherever Principia 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 recreational captains

The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put Principia on the map. It hands you the full bridge:

Anchor Watch

GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.

Onboard Cameras

Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.

Weather & Routing

GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.

Worldwide Charts

Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.

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.

Distress Mesh

Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.

Hail Any Captain

A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.

Claim Principia and switch it all on

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

Claim free → unlock everything

About Principia

What kind of vessel is Principia?

Principia is a Recreational flagged to United States of America.

What is Principia's MMSI?

Principia's MMSI is 367640890. Call sign WDH6712.

How big is Principia?

Principia is about 11.6 m long, 3.8 m on the beam, drawing 1.5 m.

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

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