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.

Vessel

Calypso

MMSI 367656010 · Call sign WDH8233

Not yet on Master's Mate

Flag

USA

Call sign

WDH8233

Official No.

RI-6308W

AIS reports

Registered in the United States, Calypso is a craft. She broadcasts as MMSI 367656010, call sign WDH8233. Calypso can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.

Free forever · No credit card

Is Calypso your boat?

Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.

Claim this boat — free →

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

Wherever Calypso 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

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

Joining the Safety Initiative Network doesn't just put Calypso 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.

Worldwide Charts

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

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.

Onboard Cameras

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

Systems Monitoring

Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.

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 Calypso and switch it all on

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

Claim free → unlock everything

About Calypso

What kind of vessel is Calypso?

Calypso is a vessel flagged to United States of America.

What is Calypso's MMSI?

Calypso's MMSI is 367656010. Call sign WDH8233.

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

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