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
Harbor Gem
MMSI 367045720 · Call sign WDC5737
Not yet on Master's MateType
Commercial Fishing Vessel
Flag
USALength
17.7 m
Beam
5.9 m
Draft
3 m
Call sign
WDC5737
Official No.
974306
AIS reports
1
Harbor Gem flies the American flag — a 17.7-metre offshore fishing boat. Harbor Gem has a beam of 5.9 m and a 3-metre draft. She's listed under MMSI 367045720, call sign WDC5737. Harbor Gem is welcome on the Master's Mate Safety Initiative Network — a free, community-run watch where boats look out for one another.
Free forever · No credit card · for working captains
Know where the fleet is. Get Harbor Gem 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 Harbor Gem 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 Harbor Gem 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 Harbor Gem and switch it all on
Free to join · nothing to install to start · cancel anytime
About Harbor Gem
What kind of vessel is Harbor Gem?
Harbor Gem is a Commercial Fishing Vessel flagged to United States of America.
What is Harbor Gem's MMSI?
Harbor Gem's MMSI is 367045720. Call sign WDC5737.
How big is Harbor Gem?
Harbor Gem is about 17.7 m long, 5.9 m on the beam, drawing 3 m.
Is Harbor Gem on the Master's Mate Safety Initiative Network?
Not yet. If Harbor Gem is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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