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.

Commercial Fishing Vessel

Harlequin

MMSI 367622250 · Call sign WDH4871

Not yet on Master's Mate

Type

Commercial Fishing Vessel

Flag

USA

Length

9.8 m

Beam

4 m

Draft

0.7 m

Call sign

WDH4871

Official No.

680988

AIS reports

Registered in the United States, Harlequin is a 9.8-metre commercial fishing vessel. She's built with a beam of 4 m and a 0.7-metre draft. On the registers she's MMSI 367622250, call sign WDH4871. Harlequin can join the Master's Mate Safety Initiative Network for free: think of it as a watch network that has every boat's back.

Free forever · No credit card · for working captains

Know where the fleet is. Get Harlequin home safe.

Live AIS traffic, weather you can plan around, engine & systems telemetry, and a distress mesh that reaches nearby boats.

Keep the fleet in sight — free →

Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers

Wherever Harlequin 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 captains

The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put Harlequin 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.

Weather & Routing

GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.

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.

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 Harlequin and switch it all on

Free to join · nothing to install to start · cancel anytime

Claim free → unlock everything

About Harlequin

What kind of vessel is Harlequin?

Harlequin is a Commercial Fishing Vessel flagged to United States of America.

What is Harlequin's MMSI?

Harlequin's MMSI is 367622250. Call sign WDH4871.

How big is Harlequin?

Harlequin is about 9.8 m long, 4 m on the beam, drawing 0.7 m.

Is Harlequin on the Master's Mate Safety Initiative Network?

Not yet. If Harlequin is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).