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.
Tanker
SIENNA
MMSI 636021927 · Call sign 5LGJ3
Not yet on Master's MateType
Tanker
Flag
LBRLength
274 m
Beam
48 m
Draft
8.4 m
Call sign
5LGJ3
IMO
9336971
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
37
SIENNA is a Liberian 274-metre tank ship. She has a beam of 48 m and a draft of 8.4 m. She broadcasts as MMSI 636021927, call sign 5LGJ3, IMO 9336971. Add SIENNA to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.
Free forever · No credit card · for commercial operators
Eyes on SIENNA, 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 3, 2026
Position
1.2721° N, 103.9356° E
Transiting the Strait of Malacca? 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 SIENNA 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 SIENNA and switch it all on
Free to join · nothing to install to start · cancel anytime
About SIENNA
What kind of vessel is SIENNA?
SIENNA is a Tanker flagged to Liberia.
Where was SIENNA last seen?
SIENNA was last reported in the Strait of Malacca in Jun 2026 on public AIS.
What is SIENNA's MMSI?
SIENNA's MMSI is 636021927. Call sign 5LGJ3. IMO 9336971.
How big is SIENNA?
SIENNA is about 274 m long, 48 m on the beam, drawing 8.4 m.
Is SIENNA on the Master's Mate Safety Initiative Network?
Not yet. If SIENNA is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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