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 Barge
HARBOR 101
U.S. Official No. 503337
Not yet on Master's MateType
Tank Barge
Flag
USALength
47.6 m
Beam
15.3 m
Draft
2.9 m
First reported
Jun 2026
AIS reports
1
On the American registry, HARBOR 101 is a 47.6-metre tanker. She has a 15.3 m beam and a draft measuring 2.9 metres. Find her under U.S. official number 503337. HARBOR 101 is welcome on the Master's Mate Safety Initiative Network — free situational awareness and a watch network shared by vessels of every size.
Free forever · No credit card · for commercial operators
Eyes on HARBOR 101, 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 HARBOR 101 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 HARBOR 101 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 HARBOR 101 and switch it all on
Free to join · nothing to install to start · cancel anytime
About HARBOR 101
What kind of vessel is HARBOR 101?
HARBOR 101 is a Tank Barge flagged to United States of America.
What is HARBOR 101's U.S. Official No.?
HARBOR 101's U.S. Official No. is 503337.
How big is HARBOR 101?
HARBOR 101 is about 47.6 m long, 15.3 m on the beam, drawing 2.9 m.
Is HARBOR 101 on the Master's Mate Safety Initiative Network?
Not yet. If HARBOR 101 is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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