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.

Towing Vessel

Uncle Otis

MMSI 367704050 · Call sign WDI4990

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

17.7 m

Beam

4.3 m

Draft

1.6 m

Call sign

WDI4990

Official No.

278241

AIS reports

Uncle Otis, a working vessel listed on the the United States registry, measures 17.7 metres on deck. Below, she has a beam measuring 4.3 metres and a draft measuring 1.6 metres. On AIS she appears as MMSI 367704050, call sign WDI4990. Claim Uncle Otis free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.

Free forever · No credit card · for working boats

Built for boats that work — like Uncle Otis.

Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.

Rig her out — free →

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

Wherever Uncle Otis 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 working boats

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

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

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.

Weather & Routing

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

Distress Mesh

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

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 Uncle Otis and switch it all on

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

Claim free → unlock everything

About Uncle Otis

What kind of vessel is Uncle Otis?

Uncle Otis is a Towing Vessel flagged to United States of America.

What is Uncle Otis's MMSI?

Uncle Otis's MMSI is 367704050. Call sign WDI4990.

How big is Uncle Otis?

Uncle Otis is about 17.7 m long, 4.3 m on the beam, drawing 1.6 m.

Is Uncle Otis on the Master's Mate Safety Initiative Network?

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