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.

Research Vessel

Reef Rescue

MMSI 368276980 · Call sign WDN3993

Not yet on Master's Mate

Type

Research Vessel

Flag

USA

Length

12.8 m

Beam

4.9 m

Draft

2.7 m

Call sign

WDN3993

Official No.

1104617

AIS reports

Out of the United States, Reef Rescue is a 12.8-metre craft. She carries 4.9 metres in the beam and a 2.7-metre draft. Her registration reads MMSI 368276980, call sign WDN3993. Reef Rescue 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 Reef Rescue 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 Reef Rescue 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 Reef Rescue 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 Reef Rescue and switch it all on

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

Claim free → unlock everything

About Reef Rescue

What kind of vessel is Reef Rescue?

Reef Rescue is a Research Vessel flagged to United States of America.

What is Reef Rescue's MMSI?

Reef Rescue's MMSI is 368276980. Call sign WDN3993.

How big is Reef Rescue?

Reef Rescue is about 12.8 m long, 4.9 m on the beam, drawing 2.7 m.

Is Reef Rescue on the Master's Mate Safety Initiative Network?

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