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.
Passenger (Inspected)
AMETHYST
MMSI 366866280 · Call sign WDA9537
Not yet on Master's MateType
Passenger (Inspected)
Flag
USALength
43.3 m
Beam
9.1 m
Draft
3.8 m
Call sign
WDA9537
IMO
9269817
Official No.
1129374
AIS reports
1
AMETHYST flies the American flag — a 43.3-metre ferry. She's built with a beam measuring 9.1 metres and a 3.8-metre draft. Look for MMSI 366866280, call sign WDA9537, IMO 9269817. It's free to add AMETHYST to the Master's Mate Safety Initiative Network — like AAA for the ocean, run by the cruisers who use it.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard AMETHYST safe.
Distress alerting, live AIS, onboard monitoring and weather routing — the safety stack for boats that carry people.
Switch on the safety stack — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever AMETHYST 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 · for passenger & charter operators
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put AMETHYST on the map. It hands you the full bridge:
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.
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
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 AMETHYST and switch it all on
Free to join · nothing to install to start · cancel anytime
About AMETHYST
What kind of vessel is AMETHYST?
AMETHYST is a Passenger (Inspected) flagged to United States of America.
What is AMETHYST's MMSI?
AMETHYST's MMSI is 366866280. Call sign WDA9537. IMO 9269817.
How big is AMETHYST?
AMETHYST is about 43.3 m long, 9.1 m on the beam, drawing 3.8 m.
Is AMETHYST on the Master's Mate Safety Initiative Network?
Not yet. If AMETHYST 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.