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.

Passenger (Inspected)

ULTRA

MMSI 367076820 · Call sign WDK6575

Not yet on Master's Mate

Type

Passenger (Inspected)

Flag

USA

Length

15 m

Beam

7.9 m

Draft

2.2 m

Call sign

WDK6575

Official No.

908818

AIS reports

On the American registry, ULTRA is a 15-metre passenger craft. Below, she has 7.9 metres in the beam and a draft measuring 2.2 metres. On AIS she appears as MMSI 367076820, call sign WDK6575. Join ULTRA to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.

Free forever · No credit card · for passenger & charter operators

Keep every soul aboard ULTRA safe.

Distress alerting, live AIS, onboard monitoring and weather routing — the safety stack for boats that carry people.

Switch on the safety stack — free →

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

Wherever ULTRA 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 passenger & charter operators

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

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

Distress Mesh

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

Live AIS & Traffic

See every vessel around you in real time. Closest-approach warnings before they matter.

Systems Monitoring

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

Weather & Routing

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

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 ULTRA and switch it all on

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

Claim free → unlock everything

About ULTRA

What kind of vessel is ULTRA?

ULTRA is a Passenger (Inspected) flagged to United States of America.

What is ULTRA's MMSI?

ULTRA's MMSI is 367076820. Call sign WDK6575.

How big is ULTRA?

ULTRA is about 15 m long, 7.9 m on the beam, drawing 2.2 m.

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

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