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.

Vessel

Sapporo

MMSI 525010361

Not yet on Master's Mate

Flag

IDN

Length

52 m

IMO

8816443

AIS reports

Sapporo, a boat listed on the Indonesia registry, measures 52 metres on deck. On the registers she's MMSI 525010361, IMO 8816443. Claim Sapporo free on the Master's Mate Safety Initiative Network and let nearby cruisers have her back.

Free forever · No credit card

Is Sapporo your boat?

Your free claim unlocks the most powerful cruising platform ever built — anchor watch, worldwide charts, live AIS, weather routing, and a network of cruisers watching each other’s backs.

Claim this boat — free →

Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers

Wherever Sapporo 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

The most powerful cruising platform ever built — yours, free.

Joining the Safety Initiative Network doesn't just put Sapporo 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.

Worldwide Charts

Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.

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.

Onboard Cameras

Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.

Systems Monitoring

Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.

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 Sapporo and switch it all on

Free to join · nothing to install to start · cancel anytime

Claim free → unlock everything

About Sapporo

What kind of vessel is Sapporo?

Sapporo is a vessel flagged to Indonesia.

What is Sapporo's MMSI?

Sapporo's MMSI is 525010361. IMO 8816443.

How big is Sapporo?

Sapporo is about 52 m long.

Is Sapporo on the Master's Mate Safety Initiative Network?

Not yet. If Sapporo is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).