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)
Surface Interval
MMSI 366668930 · Call sign WDC5170
Not yet on Master's MateType
Passenger (Inspected)
Flag
USALength
13.7 m
Beam
4.6 m
Draft
1.7 m
Call sign
WDC5170
Official No.
643315
AIS reports
2
Surface Interval flies the American flag — a 13.7-metre ferry vessel. Her hull carries a beam measuring 4.6 metres and a draft of 1.7 m. She's listed under MMSI 366668930, call sign WDC5170. Sign Surface Interval up free to the Master's Mate Safety Initiative Network and join a fleet that looks after its own.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard Surface Interval 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 Surface Interval 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 Surface Interval 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 Surface Interval and switch it all on
Free to join · nothing to install to start · cancel anytime
About Surface Interval
What kind of vessel is Surface Interval?
Surface Interval is a Passenger (Inspected) flagged to United States of America.
What is Surface Interval's MMSI?
Surface Interval's MMSI is 366668930. Call sign WDC5170.
How big is Surface Interval?
Surface Interval is about 13.7 m long, 4.6 m on the beam, drawing 1.7 m.
Is Surface Interval on the Master's Mate Safety Initiative Network?
Not yet. If Surface Interval is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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