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.
Vessel
John Oldendorff
MMSI 255806199
Not yet on Master's MateFlag
PRTLength
199.9 m
IMO
9839832
AIS reports
2
On the Portuguese registry, John Oldendorff is a 199.9-metre boat. Look for MMSI 255806199, IMO 9839832. Add John Oldendorff to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.
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Is John Oldendorff your boat?
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever John Oldendorff roams, 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
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put John Oldendorff on the map. It hands you the full bridge:
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.
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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
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.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim John Oldendorff and switch it all on
Free to join · nothing to install to start · cancel anytime
About John Oldendorff
What kind of vessel is John Oldendorff?
John Oldendorff is a vessel flagged to Portugal.
What is John Oldendorff's MMSI?
John Oldendorff's MMSI is 255806199. IMO 9839832.
How big is John Oldendorff?
John Oldendorff is about 199.9 m long.
Is John Oldendorff on the Master's Mate Safety Initiative Network?
Not yet. If John Oldendorff is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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