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

ARITAMARU

Tug · last seen 34°N 135°E · Jun 2026 · MMSI 431002928 · Call sign JD3157

Not yet on Master's Mate

Type

Tug

Length

34 m

Beam

8 m

Draft

2.9 m

Call sign

JD3157

First reported

Jun 2026

Last reported

Jun 2026

AIS reports

ARITAMARU is a 34-metre harbour tug. Her hull carries a beam measuring 8 metres and a draft of 2.9 m. On the registers she's MMSI 431002928, call sign JD3157. Give ARITAMARU the backing of the Master's Mate Safety Initiative Network — free, and a fleet that has her back.

Free forever · No credit card · for working boats

Built for boats that work — like ARITAMARU.

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

Live AIS position · Jun 15, 2026 16:51 UTC

Track ARITAMARU live — sign up free →

Position

34.0111° N, 134.5900° E

Status

Under way (engine)

Speed

0.0 kn

Course

324°

Destination

JP TKX

ETA

11-01 17:00 UTC

Working 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 working boats

The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put ARITAMARU 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 ARITAMARU and switch it all on

Free to join · nothing to install to start · cancel anytime

Claim free → unlock everything

About ARITAMARU

What kind of vessel is ARITAMARU?

ARITAMARU is a Tug.

Where was ARITAMARU last seen?

ARITAMARU was last reported in the Sea of Japan in Jun 2026 on public AIS.

What is ARITAMARU's MMSI?

ARITAMARU's MMSI is 431002928. Call sign JD3157.

How big is ARITAMARU?

ARITAMARU is about 34 m long, 8 m on the beam, drawing 2.9 m.

Is ARITAMARU on the Master's Mate Safety Initiative Network?

Not yet. If ARITAMARU is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).