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.
Recreational
On Watch
MMSI 366985220 · Call sign WDB9927
Not yet on Master's MateType
Recreational
Flag
USALength
12.4 m
Beam
7.1 m
Draft
3 m
Call sign
WDB9927
Official No.
1083772
AIS reports
1
On Watch is a private vessel hailing from the United States, 12.4 metres LOA. She has a 7.1-metre beam and a draft of 3 m. On AIS she shows as MMSI 366985220, call sign WDB9927. Bring On Watch aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.
Free forever · No credit card · for recreational captains
Keep On Watch looked after — even when you’re not aboard.
Anchor alarms that wake you, a live camera at the dock, and weather you can trust before every run.
Look after her — claim free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever On Watch 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 recreational captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put On Watch 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.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
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 On Watch and switch it all on
Free to join · nothing to install to start · cancel anytime
About On Watch
What kind of vessel is On Watch?
On Watch is a Recreational flagged to United States of America.
What is On Watch's MMSI?
On Watch's MMSI is 366985220. Call sign WDB9927.
How big is On Watch?
On Watch is about 12.4 m long, 7.1 m on the beam, drawing 3 m.
Is On Watch on the Master's Mate Safety Initiative Network?
Not yet. If On Watch is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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