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.
Vessel
YUSEISHO
MMSI 431007441 · Call sign JD3993
Not yet on Master's MateFlag
JPNLength
49 m
Beam
12 m
Call sign
JD3993
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
18
YUSEISHO, a Japanese boat, measures 49 metres on deck. YUSEISHO has a beam of 12 m. On AIS she appears as MMSI 431007441, call sign JD3993. YUSEISHO belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.
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Last known position · Jun 4, 2026
Position
35.6155° N, 139.7674° E
Crossing the Sea of Japan? You're never out there alone.
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Joining the Safety Initiative Network doesn't just put YUSEISHO on the map. It hands you the full bridge:
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
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.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
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About YUSEISHO
What kind of vessel is YUSEISHO?
YUSEISHO is a vessel flagged to Japan.
Where was YUSEISHO last seen?
YUSEISHO was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is YUSEISHO's MMSI?
YUSEISHO's MMSI is 431007441. Call sign JD3993.
How big is YUSEISHO?
YUSEISHO is about 49 m long, 12 m on the beam.
Is YUSEISHO on the Master's Mate Safety Initiative Network?
Not yet. If YUSEISHO is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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