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.
Sailing
URSA MAJOR
MMSI 258997930 · Call sign LG7633
Not yet on Master's MateType
Sailing
Flag
NORLength
15 m
Beam
5 m
Call sign
LG7633
First reported
Apr 2026
Last reported
Apr 2026
AIS reports
85
Registered in Norway, URSA MAJOR is a 15-metre cruising boat. She carries a beam of 5 m. On the registers she's MMSI 258997930, call sign LG7633. URSA MAJOR is welcome on the Master's Mate Safety Initiative Network — a free, community-run watch where boats look out for one another.
Free forever · No credit card · for cruisers
Sleep easy on the hook aboard URSA MAJOR.
GPS-precise anchor-drag alarms, ETA-calibrated weather routing, worldwide charts, and cruisers watching each other’s backs.
Set her anchor watch — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Apr 14, 2026
Position
18.0330° N, 63.0972° W
Sailing the Caribbean? 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 cruisers
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put URSA MAJOR 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.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
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.
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.
Claim URSA MAJOR and switch it all on
Free to join · nothing to install to start · cancel anytime
About URSA MAJOR
What kind of vessel is URSA MAJOR?
URSA MAJOR is a Sailing flagged to Norway.
Where was URSA MAJOR last seen?
URSA MAJOR was last reported in the Caribbean in Apr 2026 on public AIS.
What is URSA MAJOR's MMSI?
URSA MAJOR's MMSI is 258997930. Call sign LG7633.
How big is URSA MAJOR?
URSA MAJOR is about 15 m long, 5 m on the beam.
Is URSA MAJOR on the Master's Mate Safety Initiative Network?
Not yet. If URSA MAJOR is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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