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.

UNSPECIFIED

SB 104

U.S. Official No. 645848

Not yet on Master's Mate

Type

UNSPECIFIED

Flag

USA

Length

36.6 m

Beam

9.2 m

Draft

2 m

First reported

Jun 2026

AIS reports

Out of the United States, SB 104 is a 36.6-metre vessel. Her hull carries 9.2 metres in the beam and a draft measuring 2 metres. Find her under U.S. official number 645848. SB 104 can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.

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Is SB 104 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 SB 104 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 SB 104 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 SB 104 and switch it all on

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About SB 104

What kind of vessel is SB 104?

SB 104 is a UNSPECIFIED flagged to United States of America.

What is SB 104's U.S. Official No.?

SB 104's U.S. Official No. is 645848.

How big is SB 104?

SB 104 is about 36.6 m long, 9.2 m on the beam, drawing 2 m.

Is SB 104 on the Master's Mate Safety Initiative Network?

Not yet. If SB 104 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).