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.
Towing Vessel
Thornton Bros.
MMSI 367169170 · Call sign WDD6171
Not yet on Master's MateType
Towing Vessel
Flag
USALength
25.5 m
Beam
7.6 m
Draft
3.2 m
Call sign
WDD6171
IMO
8992297
Official No.
276627
AIS reports
1
Thornton Bros. is an American working vessel — 25.5 metres overall. Below, she has a beam measuring 7.6 metres and a draft measuring 3.2 metres. On AIS she shows as MMSI 367169170, call sign WDD6171, IMO 8992297. Thornton Bros. is invited to the free Master's Mate Safety Initiative Network, where cruisers keep each other safe.
Free forever · No credit card · for working boats
Built for boats that work — like Thornton Bros..
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 Thornton Bros. 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 Thornton Bros. 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 Thornton Bros. and switch it all on
Free to join · nothing to install to start · cancel anytime
About Thornton Bros.
What kind of vessel is Thornton Bros.?
Thornton Bros. is a Towing Vessel flagged to United States of America.
What is Thornton Bros.'s MMSI?
Thornton Bros.'s MMSI is 367169170. Call sign WDD6171. IMO 8992297.
How big is Thornton Bros.?
Thornton Bros. is about 25.5 m long, 7.6 m on the beam, drawing 3.2 m.
Is Thornton Bros. on the Master's Mate Safety Initiative Network?
Not yet. If Thornton Bros. 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.