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.
Recreational
Chapter 4
MMSI 367706550 · Call sign WDI5239
Not yet on Master's MateType
Recreational
Flag
USALength
11.1 m
Beam
3.7 m
Draft
2.5 m
Call sign
WDI5239
Official No.
1047927
Hull ID
TDLUS038G596
AIS reports
1
On the American registry, Chapter 4 is an 11.1-metre recreational vessel. She has a beam of 3.7 m and a draft of 2.5 m. Her registration reads MMSI 367706550, call sign WDI5239. The Master's Mate Safety Initiative Network welcomes Chapter 4 — free to join, cruiser-run, and always on watch.
Free forever · No credit card · for recreational captains
Keep Chapter 4 looked after — even when you’re not aboard.
Anchor alarms that wake you, a live camera at the dock, and weather you can trust before every run.
Look after her — claim free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Chapter 4 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 recreational captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Chapter 4 on the map. It hands you the full bridge:
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim Chapter 4 and switch it all on
Free to join · nothing to install to start · cancel anytime
About Chapter 4
What kind of vessel is Chapter 4?
Chapter 4 is a Recreational flagged to United States of America.
What is Chapter 4's MMSI?
Chapter 4's MMSI is 367706550. Call sign WDI5239.
How big is Chapter 4?
Chapter 4 is about 11.1 m long, 3.7 m on the beam, drawing 2.5 m.
Is Chapter 4 on the Master's Mate Safety Initiative Network?
Not yet. If Chapter 4 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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