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.
Military
OTB-03
MMSI 232027846 · Call sign MHJZ4
Not yet on Master's MateType
Military
Flag
GBRLength
15 m
Beam
6 m
Call sign
MHJZ4
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
23
OTB-03 flies the British flag — a 15-metre boat. OTB-03 has a 6 m beam. Find her under MMSI 232027846, call sign MHJZ4. The Master's Mate Safety Initiative Network welcomes OTB-03 — free to join, cruiser-run, and always on watch.
Free forever · No credit card
Is OTB-03 your boat?
Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.
Claim this boat — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Last known position · Jun 4, 2026
Position
50.8010° N, 1.1234° W
Crossing the English Channel? 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
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put OTB-03 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.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
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.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim OTB-03 and switch it all on
Free to join · nothing to install to start · cancel anytime
About OTB-03
What kind of vessel is OTB-03?
OTB-03 is a Military flagged to United Kingdom.
Where was OTB-03 last seen?
OTB-03 was last reported in the English Channel in Jun 2026 on public AIS.
What is OTB-03's MMSI?
OTB-03's MMSI is 232027846. Call sign MHJZ4.
How big is OTB-03?
OTB-03 is about 15 m long, 6 m on the beam.
Is OTB-03 on the Master's Mate Safety Initiative Network?
Not yet. If OTB-03 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.