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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.
Fishing
CHOKAIMARU
MMSI 431002191 · Call sign JD3143
Not yet on Master's MateType
Fishing
Flag
JPNLength
45 m
Beam
8 m
Draft
3.8 m
Call sign
JD3143
IMO
9579999
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
12
On the Japanese registry, CHOKAIMARU is a 45-metre fishing craft. She has a 8 m beam and a draft measuring 3.8 metres. She's listed under MMSI 431002191, call sign JD3143, IMO 9579999. Bring CHOKAIMARU aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.
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Know where the fleet is. Get CHOKAIMARU home safe.
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Last known position · Jun 4, 2026
Position
39.6341° N, 141.9701° E
Fishing the Sea of Japan? You're never out there alone.
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Joining the Safety Initiative Network doesn't just put CHOKAIMARU 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.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
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.
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.
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 CHOKAIMARU and switch it all on
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About CHOKAIMARU
What kind of vessel is CHOKAIMARU?
CHOKAIMARU is a Fishing flagged to Japan.
Where was CHOKAIMARU last seen?
CHOKAIMARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is CHOKAIMARU's MMSI?
CHOKAIMARU's MMSI is 431002191. Call sign JD3143. IMO 9579999.
How big is CHOKAIMARU?
CHOKAIMARU is about 45 m long, 8 m on the beam, drawing 3.8 m.
Is CHOKAIMARU on the Master's Mate Safety Initiative Network?
Not yet. If CHOKAIMARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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