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.

Vessel

USNS 1st Lt. Harry L. Martin

MMSI 338992000

Not yet on Master's Mate

Flag

USA

IMO

7720415

AIS reports

USNS 1st Lt. Harry L. Martin is a craft registered in the United States. Her registration reads MMSI 338992000, IMO 7720415. Join USNS 1st Lt. Harry L. Martin to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.

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Is USNS 1st Lt. Harry L. Martin 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.

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

Wherever USNS 1st Lt. Harry L. Martin roams, you're never out there alone.

Thousands of cruisers on the Master's Mate Network — ready to help the moment something goes wrong.

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

Joining the Safety Initiative Network doesn't just put USNS 1st Lt. Harry L. Martin 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 1st Lt. Harry L. Martin and switch it all on

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About USNS 1st Lt. Harry L. Martin

What kind of vessel is USNS 1st Lt. Harry L. Martin?

USNS 1st Lt. Harry L. Martin is a vessel flagged to United States of America.

What is USNS 1st Lt. Harry L. Martin's MMSI?

USNS 1st Lt. Harry L. Martin's MMSI is 338992000. IMO 7720415.

Is USNS 1st Lt. Harry L. Martin on the Master's Mate Safety Initiative Network?

Not yet. If USNS 1st Lt. Harry L. Martin is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).