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

DEREK JOHN JR

MMSI 367381180 · Call sign WDE6511

Not yet on Master's Mate

Type

Towing Vessel

Flag

USA

Length

19.8 m

Beam

7.3 m

Draft

2.7 m

Call sign

WDE6511

Official No.

1214706

AIS reports

DEREK JOHN JR is a harbour workboat sailing under the American flag, 19.8 metres long. She has 7.3 metres in the beam and a draft of 2.7 m. She's on record as MMSI 367381180, call sign WDE6511. Bring DEREK JOHN JR aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.

Free forever · No credit card · for working boats

Built for boats that work — like DEREK JOHN JR.

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 DEREK JOHN JR roams, you're never out there alone.

Thousands of cruisers on the Master's Mate Network — ready to help the moment something goes wrong.

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The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put DEREK JOHN JR 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 DEREK JOHN JR and switch it all on

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About DEREK JOHN JR

What kind of vessel is DEREK JOHN JR?

DEREK JOHN JR is a Towing Vessel flagged to United States of America.

What is DEREK JOHN JR's MMSI?

DEREK JOHN JR's MMSI is 367381180. Call sign WDE6511.

How big is DEREK JOHN JR?

DEREK JOHN JR is about 19.8 m long, 7.3 m on the beam, drawing 2.7 m.

Is DEREK JOHN JR on the Master's Mate Safety Initiative Network?

Not yet. If DEREK JOHN JR is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).