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 (Uninspected)
GRAND SLAM
MMSI 367034630 · Call sign WDC5029
Not yet on Master's MateType
Passenger (Uninspected)
Flag
USALength
15.8 m
Beam
4.7 m
Draft
1.9 m
Call sign
WDC5029
Official No.
1036683
AIS reports
1
GRAND SLAM flies the American flag — a 15.8-metre excursion vessel. GRAND SLAM has a 4.7-metre beam and a 1.9-metre draft. Her registration reads MMSI 367034630, call sign WDC5029. Give GRAND SLAM the backing of the Master's Mate Safety Initiative Network — free, and a fleet that has her back.
Free forever · No credit card · for passenger & charter operators
Keep every soul aboard GRAND SLAM 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 GRAND SLAM 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 GRAND SLAM 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 GRAND SLAM and switch it all on
Free to join · nothing to install to start · cancel anytime
About GRAND SLAM
What kind of vessel is GRAND SLAM?
GRAND SLAM is a Passenger (Uninspected) flagged to United States of America.
What is GRAND SLAM's MMSI?
GRAND SLAM's MMSI is 367034630. Call sign WDC5029.
How big is GRAND SLAM?
GRAND SLAM is about 15.8 m long, 4.7 m on the beam, drawing 1.9 m.
Is GRAND SLAM on the Master's Mate Safety Initiative Network?
Not yet. If GRAND SLAM is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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