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.
Passenger
OSTERN
MMSI 230035990 · Call sign OJ9503
Not yet on Master's MateType
Passenger
Flag
FINLength
33 m
Beam
10 m
Draft
3.5 m
Call sign
OJ9503
IMO
7393640
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
87
OSTERN is a ferry flagged in Finland, 33 metres overall. OSTERN has a beam of 10 m and a 3.5-metre draft. On AIS she appears as MMSI 230035990, call sign OJ9503, IMO 7393640. The Master's Mate Safety Initiative Network welcomes OSTERN — free to join, cruiser-run, and always on watch.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard OSTERN safe.
Distress alerting, live AIS, onboard monitoring and weather routing — the safety stack for boats that carry people.
Switch on the safety stack — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Live AIS position · Jun 9, 2026 08:31 UTC
Position
60.1942° N, 21.9118° E
Status
Under way (engine)
Speed
0.0 kn
Course
321°
Destination
NAUVO
ETA
05-08 20:26 UTC
Sailing 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.
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Joining the Safety Initiative Network doesn't just put OSTERN on the map. It hands you the full bridge:
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
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.
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.
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 OSTERN and switch it all on
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About OSTERN
What kind of vessel is OSTERN?
OSTERN is a Passenger flagged to Finland.
Where was OSTERN last seen?
OSTERN was last reported in the Baltic Sea in Jun 2026 on public AIS.
What is OSTERN's MMSI?
OSTERN's MMSI is 230035990. Call sign OJ9503. IMO 7393640.
How big is OSTERN?
OSTERN is about 33 m long, 10 m on the beam, drawing 3.5 m.
Is OSTERN on the Master's Mate Safety Initiative Network?
Not yet. If OSTERN is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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