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
REEF KEEPER
MMSI 503000239 · Call sign VNZ3608
Not yet on Master's MateType
Tug
Flag
AUSLength
53 m
Beam
14 m
Draft
6.2 m
Call sign
VNZ3608
IMO
9568976
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
66
REEF KEEPER is an Australian harbour tug, 53 metres long. Below, she has a 14-metre beam and a draft of 6.2 m. Find her under MMSI 503000239, call sign VNZ3608, IMO 9568976. REEF KEEPER 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 working boats
Built for boats that work — like REEF KEEPER.
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
Last known position · Jun 4, 2026
Position
16.7834° S, 145.7384° E
Working the Great Barrier Reef? 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 REEF KEEPER 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 REEF KEEPER and switch it all on
Free to join · nothing to install to start · cancel anytime
About REEF KEEPER
What kind of vessel is REEF KEEPER?
REEF KEEPER is a Tug flagged to Ashmore and Cartier Islands.
Where was REEF KEEPER last seen?
REEF KEEPER was last reported in the Great Barrier Reef in Jun 2026 on public AIS.
What is REEF KEEPER's MMSI?
REEF KEEPER's MMSI is 503000239. Call sign VNZ3608. IMO 9568976.
How big is REEF KEEPER?
REEF KEEPER is about 53 m long, 14 m on the beam, drawing 6.2 m.
Is REEF KEEPER on the Master's Mate Safety Initiative Network?
Not yet. If REEF KEEPER 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.