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
JOHN M RIVERS
MMSI 366967620 · Call sign WDK9892
Not yet on Master's MateType
Towing Vessel
Flag
USALength
168 m
Beam
22 m
Draft
2.8 m
Call sign
WDK9892
IMO
100633894
Official No.
633894
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
35
JOHN M RIVERS, an utility vessel registered in the United States, measures 168 metres on deck. JOHN M RIVERS has 22 metres in the beam and a 2.8-metre draft. Her papers read MMSI 366967620, call sign WDK9892. Join JOHN M RIVERS 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 JOHN M RIVERS.
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
Last known position · Jun 3, 2026
Position
37.9023° N, 87.5272° W
Wherever JOHN M RIVERS 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 JOHN M RIVERS 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 JOHN M RIVERS and switch it all on
Free to join · nothing to install to start · cancel anytime
About JOHN M RIVERS
What kind of vessel is JOHN M RIVERS?
JOHN M RIVERS is a Towing Vessel flagged to United States of America.
Where was JOHN M RIVERS last seen?
JOHN M RIVERS was last reported in around 38°N 88°W in Jun 2026 on public AIS.
What is JOHN M RIVERS's MMSI?
JOHN M RIVERS's MMSI is 366967620. Call sign WDK9892. IMO 100633894.
How big is JOHN M RIVERS?
JOHN M RIVERS is about 168 m long, 22 m on the beam, drawing 2.8 m.
Is JOHN M RIVERS on the Master's Mate Safety Initiative Network?
Not yet. If JOHN M RIVERS 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.