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
SEISEN MARU
Tanker · Japan · last seen 35°N 135°E · Jun 2026 · MMSI 431015615 · Call sign JD4808
Not yet on Master's MateType
Tanker
Flag
JPNLength
72 m
Beam
13 m
Draft
4.5 m
Call sign
JD4808
IMO
9893541
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
28
Out of Japan, SEISEN MARU is a 72-metre tank vessel. Her hull carries a 13-metre beam and a draft of 4.5 m. On AIS she appears as MMSI 431015615, call sign JD4808, IMO 9893541. It's free to add SEISEN MARU to the Master's Mate Safety Initiative Network — like AAA for the ocean, run by the cruisers who use it.
Free forever · No credit card · for commercial operators
Eyes on SEISEN 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 14:18 UTC
Position
34.5366° N, 135.3227° E
Status
At anchor
Speed
0.0 kn
Course
356°
Destination
>JP SBK OFF
ETA
06-15 12:30 UTC
Transiting the Sea of Japan? You're never out there alone.
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Joining the Safety Initiative Network doesn't just put SEISEN 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 SEISEN MARU and switch it all on
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About SEISEN MARU
What kind of vessel is SEISEN MARU?
SEISEN MARU is a Tanker flagged to Japan.
Where was SEISEN MARU last seen?
SEISEN MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is SEISEN MARU's MMSI?
SEISEN MARU's MMSI is 431015615. Call sign JD4808. IMO 9893541.
How big is SEISEN MARU?
SEISEN MARU is about 72 m long, 13 m on the beam, drawing 4.5 m.
Is SEISEN MARU on the Master's Mate Safety Initiative Network?
Not yet. If SEISEN MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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