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.
Fishing Tender
Sea Lion
MMSI 366971250 · Call sign WDF4650
Not yet on Master's MateType
Fishing Tender
Flag
USALength
24.7 m
Beam
7.9 m
Draft
2.3 m
Call sign
WDF4650
IMO
5316155
Official No.
249301
AIS reports
2
An American working fishing boat, Sea Lion measures 24.7 metres. She's built with a beam measuring 7.9 metres and a 2.3 m draft. She's listed under MMSI 366971250, call sign WDF4650, IMO 5316155. Add Sea Lion 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 captains
Know where the fleet is. Get Sea Lion 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 Sea Lion 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 Sea Lion 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 Sea Lion and switch it all on
Free to join · nothing to install to start · cancel anytime
About Sea Lion
What kind of vessel is Sea Lion?
Sea Lion is a Fishing Tender flagged to United States of America.
What is Sea Lion's MMSI?
Sea Lion's MMSI is 366971250. Call sign WDF4650. IMO 5316155.
How big is Sea Lion?
Sea Lion is about 24.7 m long, 7.9 m on the beam, drawing 2.3 m.
Is Sea Lion on the Master's Mate Safety Initiative Network?
Not yet. If Sea Lion is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
© 2026 Master’s Mate. All rights reserved.