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
KEYSTONE
MMSI 368141960 · Call sign WDL5528
Not yet on Master's MateType
Tug
Flag
USALength
211 m
Beam
18 m
Draft
3.1 m
Call sign
WDL5528
Official No.
1273623
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
86
KEYSTONE is a harbour tug flagged in the United States, 211 metres long. Her hull carries a beam measuring 18 metres and a draft of 3.1 m. Find her under MMSI 368141960, call sign WDL5528. Claim KEYSTONE free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.
Free forever · No credit card · for working boats
Built for boats that work — like KEYSTONE.
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
29.5849° N, 94.4148° W
Working the Gulf of Mexico? 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 KEYSTONE 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 KEYSTONE and switch it all on
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About KEYSTONE
What kind of vessel is KEYSTONE?
KEYSTONE is a Tug flagged to United States of America.
Where was KEYSTONE last seen?
KEYSTONE was last reported in the Gulf of Mexico in Jun 2026 on public AIS.
What is KEYSTONE's MMSI?
KEYSTONE's MMSI is 368141960. Call sign WDL5528.
How big is KEYSTONE?
KEYSTONE is about 211 m long, 18 m on the beam, drawing 3.1 m.
Is KEYSTONE on the Master's Mate Safety Initiative Network?
Not yet. If KEYSTONE is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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