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
GPO Sapphire
MMSI 538008298
Not yet on Master's MateFlag
MHLLength
225 m
IMO
9760445
AIS reports
2
Registered in the Marshall Islands, GPO Sapphire is a 225-metre craft. On AIS she shows as MMSI 538008298, IMO 9760445. GPO Sapphire 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
Is GPO Sapphire 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
Live AIS position · Jun 9, 2026 23:46 UTC
Position
52.2079° N, 4.2394° E
Status
At anchor
Speed
0.2 kn
Course
37°
Destination
NLSCE
ETA
06-08 07:00 UTC
Crossing the North 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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The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put GPO Sapphire 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 GPO Sapphire and switch it all on
Free to join · nothing to install to start · cancel anytime
About GPO Sapphire
What kind of vessel is GPO Sapphire?
GPO Sapphire is a vessel flagged to Marshall Islands.
Where was GPO Sapphire last seen?
GPO Sapphire was last reported in the North Sea on public AIS.
What is GPO Sapphire's MMSI?
GPO Sapphire's MMSI is 538008298. IMO 9760445.
How big is GPO Sapphire?
GPO Sapphire is about 225 m long.
Is GPO Sapphire on the Master's Mate Safety Initiative Network?
Not yet. If GPO Sapphire is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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