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.
Passenger (Inspected)
J-MACK
U.S. Official No. 545436
Not yet on Master's MateType
Passenger (Inspected)
Flag
USALength
19 m
Beam
7.3 m
Draft
1.1 m
First reported
Jun 2026
AIS reports
1
J-MACK is an American passenger vessel, 19 metres in length. She's built with a 7.3 m beam and a 1.1 m draft. Look for U.S. official number 545436. J-MACK is welcome on the Master's Mate Safety Initiative Network — a free, community-run watch where boats look out for one another.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard J-MACK safe.
Distress alerting, live AIS, onboard monitoring and weather routing — the safety stack for boats that carry people.
Switch on the safety stack — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever J-MACK 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 passenger & charter operators
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put J-MACK on the map. It hands you the full bridge:
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
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.
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.
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 J-MACK and switch it all on
Free to join · nothing to install to start · cancel anytime
About J-MACK
What kind of vessel is J-MACK?
J-MACK is a Passenger (Inspected) flagged to United States of America.
What is J-MACK's U.S. Official No.?
J-MACK's U.S. Official No. is 545436.
How big is J-MACK?
J-MACK is about 19 m long, 7.3 m on the beam, drawing 1.1 m.
Is J-MACK on the Master's Mate Safety Initiative Network?
Not yet. If J-MACK 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.