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.
Passenger (Inspected)
High Maintenance
MMSI 367499860 · Call sign WDF8909
Not yet on Master's MateType
Passenger (Inspected)
Flag
USALength
9.4 m
Beam
3.2 m
Draft
1.8 m
Call sign
WDF8909
Official No.
1226727
AIS reports
1
High Maintenance, a ferry flying the flag of the United States, measures 9.4 metres on deck. She's built with a beam measuring 3.2 metres and a 1.8-metre draft. Officially she's MMSI 367499860, call sign WDF8909. Join High Maintenance to the Master's Mate Safety Initiative Network — free, and built by cruisers for cruisers.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard High Maintenance safe.
Distress alerting, live AIS, onboard monitoring and weather routing — the safety stack for boats that carry people.
Switch on the safety stack — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Wherever High Maintenance 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 passenger & charter operators
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put High Maintenance on the map. It hands you the full bridge:
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
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 High Maintenance and switch it all on
Free to join · nothing to install to start · cancel anytime
About High Maintenance
What kind of vessel is High Maintenance?
High Maintenance is a Passenger (Inspected) flagged to United States of America.
What is High Maintenance's MMSI?
High Maintenance's MMSI is 367499860. Call sign WDF8909.
How big is High Maintenance?
High Maintenance is about 9.4 m long, 3.2 m on the beam, drawing 1.8 m.
Is High Maintenance on the Master's Mate Safety Initiative Network?
Not yet. If High Maintenance is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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