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
JUPITER
MMSI 230711000 · Call sign OJUW
Not yet on Master's MateType
Tug
Flag
FINLength
30 m
Beam
10 m
Draft
4 m
Call sign
OJUW
IMO
9287431
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
85
On the Finnish registry, JUPITER is a 30-metre tugboat. She's built with a beam of 10 m and a 4 m draft. Her registration reads MMSI 230711000, call sign OJUW, IMO 9287431. JUPITER earns her keep on the water; the free Master's Mate Safety Initiative Network keeps a watching fleet and a distress mesh close at hand.
Free forever · No credit card · for working boats
Built for boats that work — like JUPITER.
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 9, 2026 05:00 UTC
Position
61.1330° N, 21.4416° E
Status
Under way (engine)
Speed
0.0 kn
Course
267°
Destination
HARBOUR ASSISTANCE
ETA
11-30 12:00 UTC
Working the Baltic Sea? 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 JUPITER 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 JUPITER and switch it all on
Free to join · nothing to install to start · cancel anytime
About JUPITER
What kind of vessel is JUPITER?
JUPITER is a Tug flagged to Finland.
Where was JUPITER last seen?
JUPITER was last reported in the Baltic Sea in Jun 2026 on public AIS.
What is JUPITER's MMSI?
JUPITER's MMSI is 230711000. Call sign OJUW. IMO 9287431.
How big is JUPITER?
JUPITER is about 30 m long, 10 m on the beam, drawing 4 m.
Is JUPITER on the Master's Mate Safety Initiative Network?
Not yet. If JUPITER 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.