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
KYOWA MARU NO.1
MMSI 431009445 · Call sign JD4185
Not yet on Master's MateType
Tanker
Flag
JPNLength
59 m
Beam
10 m
Draft
3.5 m
Call sign
JD4185
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
11
KYOWA MARU NO.1 flies the Japanese flag — a 59-metre tanker. KYOWA MARU NO.1 has a beam of 10 m and a 3.5-metre draft. She's listed under MMSI 431009445, call sign JD4185. It's free to add KYOWA MARU NO.1 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 KYOWA MARU NO.1, 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
34.1083° N, 135.0873° E
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 KYOWA MARU NO.1 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 KYOWA MARU NO.1 and switch it all on
Free to join · nothing to install to start · cancel anytime
About KYOWA MARU NO.1
What kind of vessel is KYOWA MARU NO.1?
KYOWA MARU NO.1 is a Tanker flagged to Japan.
Where was KYOWA MARU NO.1 last seen?
KYOWA MARU NO.1 was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is KYOWA MARU NO.1's MMSI?
KYOWA MARU NO.1's MMSI is 431009445. Call sign JD4185.
How big is KYOWA MARU NO.1?
KYOWA MARU NO.1 is about 59 m long, 10 m on the beam, drawing 3.5 m.
Is KYOWA MARU NO.1 on the Master's Mate Safety Initiative Network?
Not yet. If KYOWA MARU NO.1 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.