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
ROCK-A-BYE
U.S. Official No. 504147
Not yet on Master's MateType
Recreational
Flag
USALength
11.3 m
Beam
3.9 m
Draft
1.9 m
First reported
Jun 2026
AIS reports
1
On the American registry, ROCK-A-BYE is an 11.3-metre leisure boat. ROCK-A-BYE has a beam of 3.9 m and a 1.9 m draft. Look for U.S. official number 504147. Claim ROCK-A-BYE free and let the Master's Mate Safety Initiative Network keep an eye on her, on the water or off.
Free forever · No credit card · for recreational captains
Keep ROCK-A-BYE 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 ROCK-A-BYE 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 ROCK-A-BYE 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 ROCK-A-BYE and switch it all on
Free to join · nothing to install to start · cancel anytime
About ROCK-A-BYE
What kind of vessel is ROCK-A-BYE?
ROCK-A-BYE is a Recreational flagged to United States of America.
What is ROCK-A-BYE's U.S. Official No.?
ROCK-A-BYE's U.S. Official No. is 504147.
How big is ROCK-A-BYE?
ROCK-A-BYE is about 11.3 m long, 3.9 m on the beam, drawing 1.9 m.
Is ROCK-A-BYE on the Master's Mate Safety Initiative Network?
Not yet. If ROCK-A-BYE 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.