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.

Public Vessel, Unclassified

USNS Invincible

MMSI 338941000 · Call sign NIYJ

Not yet on Master's Mate

Type

Public Vessel, Unclassified

Flag

USA

Length

184 m

Beam

13.1 m

Draft

6.1 m

Call sign

NIYJ

IMO

8833879

Official No.

1327622

AIS reports

Registered in the United States, USNS Invincible is an 184-metre craft. She has a 13.1 m beam and a draft measuring 6.1 metres. Officially she's MMSI 338941000, call sign NIYJ, IMO 8833879. The Master's Mate Safety Initiative Network welcomes USNS Invincible — free to join, cruiser-run, and always on watch.

Free forever · No credit card

Is USNS Invincible 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 USNS Invincible 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 USNS Invincible 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 USNS Invincible and switch it all on

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

Claim free → unlock everything

About USNS Invincible

What kind of vessel is USNS Invincible?

USNS Invincible is a Public Vessel, Unclassified flagged to United States of America.

What is USNS Invincible's MMSI?

USNS Invincible's MMSI is 338941000. Call sign NIYJ. IMO 8833879.

How big is USNS Invincible?

USNS Invincible is about 184 m long, 13.1 m on the beam, drawing 6.1 m.

Is USNS Invincible on the Master's Mate Safety Initiative Network?

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