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.
Cargo
BUILDER
MMSI 636020873 · Call sign 5LBD3
Not yet on Master's MateType
Cargo
Flag
LBRLength
229 m
Beam
32 m
Draft
13.8 m
Call sign
5LBD3
IMO
9589255
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
87
On the Liberian registry, BUILDER is a 229-metre merchant ship. She has a beam of 32 m and a draft measuring 13.8 metres. On AIS she appears as MMSI 636020873, call sign 5LBD3, IMO 9589255. BUILDER 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 commercial operators
Eyes on BUILDER, around the clock.
Real-time AIS, full systems telemetry, distress alerting and worldwide charts — your hull on one dashboard, from anywhere.
Put her on the dashboard — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Jun 4, 2026
Position
36.8763° N, 75.8898° W
Transiting Chesapeake Bay? 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 · for commercial operators
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put BUILDER on the map. It hands you the full bridge:
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
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.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim BUILDER and switch it all on
Free to join · nothing to install to start · cancel anytime
About BUILDER
What kind of vessel is BUILDER?
BUILDER is a Cargo flagged to Liberia.
Where was BUILDER last seen?
BUILDER was last reported in Chesapeake Bay in Jun 2026 on public AIS.
What is BUILDER's MMSI?
BUILDER's MMSI is 636020873. Call sign 5LBD3. IMO 9589255.
How big is BUILDER?
BUILDER is about 229 m long, 32 m on the beam, drawing 13.8 m.
Is BUILDER on the Master's Mate Safety Initiative Network?
Not yet. If BUILDER is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.