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 Mercy

MMSI 367816000 · Call sign NMER

Not yet on Master's Mate

Type

Public Vessel, Unclassified

Flag

USA

Length

272.5 m

Beam

32.2 m

Draft

17.6 m

Call sign

NMER

IMO

7390454

Official No.

570876

AIS reports

USNS Mercy, a boat sailing under the American flag, measures 272.5 metres on deck. She has a beam measuring 32.2 metres and a draft of 17.6 m. Officially she's MMSI 367816000, call sign NMER, IMO 7390454. Give USNS Mercy the backing of the Master's Mate Safety Initiative Network — free, and a fleet that has her back.

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Is USNS Mercy 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 Mercy 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 Mercy 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 Mercy and switch it all on

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About USNS Mercy

What kind of vessel is USNS Mercy?

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

What is USNS Mercy's MMSI?

USNS Mercy's MMSI is 367816000. Call sign NMER. IMO 7390454.

How big is USNS Mercy?

USNS Mercy is about 272.5 m long, 32.2 m on the beam, drawing 17.6 m.

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

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