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.
Towing Vessel
Tugboat Spence
MMSI 367021860 · Call sign WDC4261
Not yet on Master's MateType
Towing Vessel
Flag
USALength
28 m
Beam
7.9 m
Draft
3.4 m
Call sign
WDC4261
IMO
7506780
Official No.
559788
AIS reports
2
On the American registry, Tugboat Spence is a 28-metre working craft. Below, she has a 7.9-metre beam and a draft of 3.4 m. On the registers she's MMSI 367021860, call sign WDC4261, IMO 7506780. Tugboat Spence 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 boats
Built for boats that work — like Tugboat Spence.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever Tugboat Spence 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 boats
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Tugboat Spence on the map. It hands you the full bridge:
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.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
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 Tugboat Spence and switch it all on
Free to join · nothing to install to start · cancel anytime
About Tugboat Spence
What kind of vessel is Tugboat Spence?
Tugboat Spence is a Towing Vessel flagged to United States of America.
What is Tugboat Spence's MMSI?
Tugboat Spence's MMSI is 367021860. Call sign WDC4261. IMO 7506780.
How big is Tugboat Spence?
Tugboat Spence is about 28 m long, 7.9 m on the beam, drawing 3.4 m.
Is Tugboat Spence on the Master's Mate Safety Initiative Network?
Not yet. If Tugboat Spence is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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