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.
Tug
OHGI MARU
MMSI 431006373 · Call sign JD3850
Not yet on Master's MateType
Tug
Flag
JPNLength
37 m
Beam
10 m
Draft
3 m
Call sign
JD3850
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
46
OHGI MARU flies the Japanese flag — a 37-metre harbour tug. She has a 10 m beam and a draft of 3 m. On AIS she appears as MMSI 431006373, call sign JD3850. OHGI MARU belongs on the Master's Mate Safety Initiative Network, a free safety net shared by boats the world over.
Free forever · No credit card · for working boats
Built for boats that work — like OHGI MARU.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Jun 4, 2026
Position
35.4327° N, 139.7554° E
Working the Sea of Japan? You're never out there alone.
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Joining the Safety Initiative Network doesn't just put OHGI MARU on the map. It hands you the full bridge:
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
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.
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 OHGI MARU and switch it all on
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About OHGI MARU
What kind of vessel is OHGI MARU?
OHGI MARU is a Tug flagged to Japan.
Where was OHGI MARU last seen?
OHGI MARU was last reported in the Sea of Japan in Jun 2026 on public AIS.
What is OHGI MARU's MMSI?
OHGI MARU's MMSI is 431006373. Call sign JD3850.
How big is OHGI MARU?
OHGI MARU is about 37 m long, 10 m on the beam, drawing 3 m.
Is OHGI MARU on the Master's Mate Safety Initiative Network?
Not yet. If OHGI MARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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