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.

Tank Ship

CHALLENGE

MMSI 303104000 · Call sign KNJL

Not yet on Master's Mate

Type

Tank Ship

Flag

USA

Length

186.9 m

Beam

32.2 m

Draft

18.3 m

Call sign

KNJL

IMO

7816551

Official No.

642151

AIS reports

Registered in the United States, CHALLENGE is an 186.9-metre tanker. She carries 32.2 metres in the beam and a 18.3-metre draft. On AIS she shows as MMSI 303104000, call sign KNJL, IMO 7816551. Put CHALLENGE on the Master's Mate Safety Initiative Network — free to claim, with a whole fleet watching out for her.

Free forever · No credit card · for commercial operators

Eyes on CHALLENGE, around the clock.

Real-time AIS, full systems telemetry, distress alerting and worldwide charts — your hull on one dashboard, from anywhere.

Put her on the dashboard — free →

Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers

Wherever CHALLENGE 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 commercial operators

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

Joining the Safety Initiative Network doesn't just put CHALLENGE on the map. It hands you the full bridge:

Live AIS & Traffic

See every vessel around you in real time. Closest-approach warnings before they matter.

Systems Monitoring

Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.

Distress Mesh

Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.

Worldwide Charts

Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.

Weather & Routing

GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.

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.

Hail Any Captain

A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.

Claim CHALLENGE and switch it all on

Free to join · nothing to install to start · cancel anytime

Claim free → unlock everything

About CHALLENGE

What kind of vessel is CHALLENGE?

CHALLENGE is a Tank Ship flagged to United States of America.

What is CHALLENGE's MMSI?

CHALLENGE's MMSI is 303104000. Call sign KNJL. IMO 7816551.

How big is CHALLENGE?

CHALLENGE is about 186.9 m long, 32.2 m on the beam, drawing 18.3 m.

Is CHALLENGE on the Master's Mate Safety Initiative Network?

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