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.
Recreational
Tandemeer
MMSI 368285190 · Call sign WDN4898
Not yet on Master's MateType
Recreational
Flag
USALength
15.6 m
Beam
4.7 m
Draft
3 m
Call sign
WDN4898
Official No.
623051
AIS reports
1
Tandemeer is an American 15.6-metre recreational boat. Tandemeer has 4.7 metres in the beam and a 3-metre draft. Her papers read MMSI 368285190, call sign WDN4898. Give Tandemeer the backing of the Master's Mate Safety Initiative Network — free, and a fleet that has her back.
Free forever · No credit card · for recreational captains
Keep Tandemeer looked after — even when you’re not aboard.
Anchor alarms that wake you, a live camera at the dock, and weather you can trust before every run.
Look after her — claim free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Live AIS position · Jun 9, 2026 13:18 UTC
Position
37.5617° N, 76.3095° W
Status
Under way (engine)
Speed
0.1 kn
Course
360°
Cruising Chesapeake Bay? 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 recreational captains
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put Tandemeer on the map. It hands you the full bridge:
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
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.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim Tandemeer and switch it all on
Free to join · nothing to install to start · cancel anytime
About Tandemeer
What kind of vessel is Tandemeer?
Tandemeer is a Recreational flagged to United States of America.
Where was Tandemeer last seen?
Tandemeer was last reported in Chesapeake Bay on public AIS.
What is Tandemeer's MMSI?
Tandemeer's MMSI is 368285190. Call sign WDN4898.
How big is Tandemeer?
Tandemeer is about 15.6 m long, 4.7 m on the beam, drawing 3 m.
Is Tandemeer on the Master's Mate Safety Initiative Network?
Not yet. If Tandemeer is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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