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.
Offshore Supply Vessel
S.T.C. LAUNCH 104
U.S. Official No. 540284
Not yet on Master's Mate
Type
Offshore Supply Vessel
Flag
USA
Length
11.3 m
Beam
4 m
Draft
1.7 m
First reported
Jun 2026
AIS reports
1
On the American registry, S.T.C. LAUNCH 104 is an 11.3-metre workboat. S.T.C. LAUNCH 104 has a beam of 4 m and a 1.7 m draft. Look for U.S. official number 540284. S.T.C. LAUNCH 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.
Free forever · No credit card · for working boats
Built for boats that work — like S.T.C. LAUNCH 104.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.