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
SENREI MARU
Tanker · last seen 34°N 135°E · Jun 2026 · MMSI 431017504 · Call sign JD4939
Not yet on Master's MateType
Tanker
Length
68 m
Beam
12 m
Draft
5 m
Call sign
JD4939
IMO
9918353
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
11
SENREI MARU is a tank ship, spanning 68 metres. She has a 12 m beam and a draft measuring 5 metres. She's on record as MMSI 431017504, call sign JD4939, IMO 9918353. The Master's Mate Safety Initiative Network welcomes SENREI MARU — free to join, cruiser-run, and always on watch.
Free forever · No credit card · for commercial operators
Eyes on SENREI MARU, 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
Live AIS position · Jun 15, 2026 15:19 UTC
Position
34.2647° N, 134.5440° E
Status
At anchor
Speed
0.0 kn
Course
142°
Destination
>JP KWS YK1
ETA
06-16 12:00 UTC
Transiting the Sea of Japan? 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 SENREI MARU 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 SENREI MARU and switch it all on
Free to join · nothing to install to start · cancel anytime
About SENREI MARU
What kind of vessel is SENREI MARU?
SENREI MARU is a Tanker.
Where was SENREI MARU last seen?
SENREI MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is SENREI MARU's MMSI?
SENREI MARU's MMSI is 431017504. Call sign JD4939. IMO 9918353.
How big is SENREI MARU?
SENREI MARU is about 68 m long, 12 m on the beam, drawing 5 m.
Is SENREI MARU on the Master's Mate Safety Initiative Network?
Not yet. If SENREI MARU 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.