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
OP CALLAIS
MMSI 366923790 · Call sign WDB6392
Not yet on Master's MateType
Offshore Supply Vessel
Flag
USALength
39.5 m
Beam
11 m
Draft
3.7 m
Call sign
WDB6392
IMO
8987840
Official No.
1149732
AIS reports
1
Out of the United States, OP CALLAIS is a 39.5-metre working craft. Below, she has a beam of 11 m and a draft of 3.7 m. On AIS she shows as MMSI 366923790, call sign WDB6392, IMO 8987840. Add OP CALLAIS to the Master's Mate Safety Initiative Network — free to join, and the fleet keeps an eye out for each other.
Free forever · No credit card · for working boats
Built for boats that work — like OP CALLAIS.
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 OP CALLAIS 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 OP CALLAIS 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 OP CALLAIS and switch it all on
Free to join · nothing to install to start · cancel anytime
About OP CALLAIS
What kind of vessel is OP CALLAIS?
OP CALLAIS is a Offshore Supply Vessel flagged to United States of America.
What is OP CALLAIS's MMSI?
OP CALLAIS's MMSI is 366923790. Call sign WDB6392. IMO 8987840.
How big is OP CALLAIS?
OP CALLAIS is about 39.5 m long, 11 m on the beam, drawing 3.7 m.
Is OP CALLAIS on the Master's Mate Safety Initiative Network?
Not yet. If OP CALLAIS is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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