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.
Offshore Supply Vessel
Sonnet 53
Offshore Supply Vessel · United States of America · MMSI 338424000 · Call sign WDN7271
Not yet on Master's MateType
Offshore Supply Vessel
Flag
USALength
84.1 m
Beam
18.3 m
Draft
8.4 m
Call sign
WDN7271
IMO
9132325
Official No.
1075679
AIS reports
6
Sonnet 53, an utility boat under the American flag, measures 84.1 metres on deck. Sonnet 53 has a beam of 18.3 m and a 8.4-metre draft. On AIS she shows as MMSI 338424000, call sign WDN7271, IMO 9132325. Join Sonnet 53 to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.
Free forever · No credit card · for working boats
Built for boats that work — like Sonnet 53.
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
Wherever Sonnet 53 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 working boats
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Sonnet 53 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 Sonnet 53 and switch it all on
Free to join · nothing to install to start · cancel anytime
About Sonnet 53
What kind of vessel is Sonnet 53?
Sonnet 53 is a Offshore Supply Vessel flagged to United States of America.
What is Sonnet 53's MMSI?
Sonnet 53's MMSI is 338424000. Call sign WDN7271. IMO 9132325.
How big is Sonnet 53?
Sonnet 53 is about 84.1 m long, 18.3 m on the beam, drawing 8.4 m.
Is Sonnet 53 on the Master's Mate Safety Initiative Network?
Not yet. If Sonnet 53 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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