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.
Cargo
SUBSEA RESPONDER IV
MMSI 538009699 · Call sign V7A5057
Not yet on Master's MateType
Cargo
Flag
MHLLength
90 m
Beam
18 m
Draft
5 m
Call sign
V7A5057
IMO
9400693
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
85
A Marshall Islands merchant ship, SUBSEA RESPONDER IV measures 90 metres. Her hull carries a 18 m beam and a draft measuring 5 metres. On the registers she's MMSI 538009699, call sign V7A5057, IMO 9400693. Give SUBSEA RESPONDER IV the backing of the Master's Mate Safety Initiative Network — free, and a fleet that has her back.
Free forever · No credit card · for commercial operators
Eyes on SUBSEA RESPONDER IV, 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
Live AIS position · Jun 9, 2026 23:51 UTC
Position
29.9492° N, 93.8639° W
Status
Moored
Speed
0.0 kn
Course
259°
Destination
PORT ARTHUR TX
ETA
05-28 01:00 UTC
Transiting the Gulf of Mexico? You're never out there alone.
Thousands of cruisers on the Master's Mate Network — ready to help the moment something goes wrong.
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The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put SUBSEA RESPONDER IV 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 SUBSEA RESPONDER IV and switch it all on
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About SUBSEA RESPONDER IV
What kind of vessel is SUBSEA RESPONDER IV?
SUBSEA RESPONDER IV is a Cargo flagged to Marshall Islands.
Where was SUBSEA RESPONDER IV last seen?
SUBSEA RESPONDER IV was last reported in the Gulf of Mexico in Jun 2026 on public AIS.
What is SUBSEA RESPONDER IV's MMSI?
SUBSEA RESPONDER IV's MMSI is 538009699. Call sign V7A5057. IMO 9400693.
How big is SUBSEA RESPONDER IV?
SUBSEA RESPONDER IV is about 90 m long, 18 m on the beam, drawing 5 m.
Is SUBSEA RESPONDER IV on the Master's Mate Safety Initiative Network?
Not yet. If SUBSEA RESPONDER IV is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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