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.

Commercial Fishing Vessel

Grandma

MMSI 367743320 · Call sign WDI8903

Not yet on Master's Mate

Type

Commercial Fishing Vessel

Flag

USA

Length

23.2 m

Beam

6.7 m

Draft

3.4 m

Call sign

WDI8903

IMO

8885341

Official No.

996177

AIS reports

Grandma, a fishing trawler registered in the United States, measures 23.2 metres on deck. She has a 6.7 m beam and a draft of 3.4 m. She's listed under MMSI 367743320, call sign WDI8903, IMO 8885341. Grandma 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 · for working captains

Know where the fleet is. Get Grandma home safe.

Live AIS traffic, weather you can plan around, engine & systems telemetry, and a distress mesh that reaches nearby boats.

Keep the fleet in sight — free →

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

Wherever Grandma 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 captains

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

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

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.

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.

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 Grandma and switch it all on

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

Claim free → unlock everything

About Grandma

What kind of vessel is Grandma?

Grandma is a Commercial Fishing Vessel flagged to United States of America.

What is Grandma's MMSI?

Grandma's MMSI is 367743320. Call sign WDI8903. IMO 8885341.

How big is Grandma?

Grandma is about 23.2 m long, 6.7 m on the beam, drawing 3.4 m.

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

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