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
Harpoon
MMSI 367681940 · Call sign WDI2804
Not yet on Master's MateType
Recreational
Flag
USALength
8 m
Beam
2.9 m
Draft
1.5 m
Call sign
WDI2804
Official No.
1234074
Hull ID
NTK26177E111
AIS reports
1
Harpoon is a pleasure craft on the the United States registry, 8 metres in length. She's built with a 2.9-metre beam and a 1.5 m draft. She's on record as MMSI 367681940, call sign WDI2804. Join Harpoon to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.
Free forever · No credit card · for recreational captains
Keep Harpoon 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 Harpoon 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 Harpoon 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 Harpoon and switch it all on
Free to join · nothing to install to start · cancel anytime
About Harpoon
What kind of vessel is Harpoon?
Harpoon is a Recreational flagged to United States of America.
What is Harpoon's MMSI?
Harpoon's MMSI is 367681940. Call sign WDI2804.
How big is Harpoon?
Harpoon is about 8 m long, 2.9 m on the beam, drawing 1.5 m.
Is Harpoon on the Master's Mate Safety Initiative Network?
Not yet. If Harpoon is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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