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.
Offshore Supply Vessel
Harvey Explorer
MMSI 369286000 · Call sign WDB4217
Not yet on Master's MateType
Offshore Supply Vessel
Flag
USALength
66.8 m
Beam
17.1 m
Draft
5.6 m
Call sign
WDB4217
IMO
9270127
Official No.
1141144
AIS reports
1
Harvey Explorer is a working vessel on the the United States registry, 66.8 metres on deck. She has a beam of 17.1 m and a draft measuring 5.6 metres. Her papers read MMSI 369286000, call sign WDB4217, IMO 9270127. Put Harvey Explorer on the Master's Mate Safety Initiative Network — free to claim, with a whole fleet watching out for her.
Free forever · No credit card · for working boats
Built for boats that work — like Harvey Explorer.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Harvey Explorer 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 working boats
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Harvey Explorer on the map. It hands you the full bridge:
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.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
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 Harvey Explorer and switch it all on
Free to join · nothing to install to start · cancel anytime
About Harvey Explorer
What kind of vessel is Harvey Explorer?
Harvey Explorer is a Offshore Supply Vessel flagged to United States of America.
What is Harvey Explorer's MMSI?
Harvey Explorer's MMSI is 369286000. Call sign WDB4217. IMO 9270127.
How big is Harvey Explorer?
Harvey Explorer is about 66.8 m long, 17.1 m on the beam, drawing 5.6 m.
Is Harvey Explorer on the Master's Mate Safety Initiative Network?
Not yet. If Harvey Explorer is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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