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
Sarah B
MMSI 368278820 · Call sign WDN4195
Not yet on Master's MateType
Towing Vessel
Flag
USALength
13.7 m
Beam
3.7 m
Draft
2 m
Call sign
WDN4195
Official No.
1107311
AIS reports
1
Sarah B flies the American flag — a 13.7-metre harbour workboat. Her hull carries 3.7 metres in the beam and a draft of 2 m. She's on record as MMSI 368278820, call sign WDN4195. There's a place for Sarah B on the Master's Mate Safety Initiative Network — free, community-driven, like AAA for the ocean.
Free forever · No credit card · for working boats
Built for boats that work — like Sarah B.
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 Sarah B 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 Sarah B 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 Sarah B and switch it all on
Free to join · nothing to install to start · cancel anytime
About Sarah B
What kind of vessel is Sarah B?
Sarah B is a Towing Vessel flagged to United States of America.
What is Sarah B's MMSI?
Sarah B's MMSI is 368278820. Call sign WDN4195.
How big is Sarah B?
Sarah B is about 13.7 m long, 3.7 m on the beam, drawing 2 m.
Is Sarah B on the Master's Mate Safety Initiative Network?
Not yet. If Sarah B 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.