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

Thumper

MMSI 366822020 · Call sign WDA5615

Not yet on Master's Mate

Type

Recreational

Flag

USA

Length

11 m

Beam

3.6 m

Draft

1.7 m

Call sign

WDA5615

Official No.

1114184

AIS reports

Thumper is a weekend cruiser on the the United States registry, 11 metres on deck. She has 3.6 metres in the beam and a draft measuring 1.7 metres. Her registration reads MMSI 366822020, call sign WDA5615. Bring Thumper aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.

Free forever · No credit card · for recreational captains

Keep Thumper 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 Thumper 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 Thumper 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 Thumper and switch it all on

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

Claim free → unlock everything

About Thumper

What kind of vessel is Thumper?

Thumper is a Recreational flagged to United States of America.

What is Thumper's MMSI?

Thumper's MMSI is 366822020. Call sign WDA5615.

How big is Thumper?

Thumper is about 11 m long, 3.6 m on the beam, drawing 1.7 m.

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

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