Now in beta · Explorer plan free forever

Your boat, watching itself.

Live data from every sensor on your boat. A co-captain that flags squalls, anchor drag, and tide windows before you ask. From anywhere with a signal.

SeaLink.cloud dashboard — live sensor pills, GPS map, and anchor alarm

Live data streaming from real Sealink boats

What you get

Three things every boat should have.

Built for the way captains actually use a boat — not for a feature list.

📡

See everything from anywhere

Wind, depth, batteries, solar, engine, tanks, position — streamed live from your boat to the dashboard the second a sensor reports. Open it from the marina café, a hotel room, or the helm.

🧭

A co-captain who never sleeps

Reads your sensors and the forecast around the clock. Surfaces "three things you should know" at first coffee — squall risk, anchor drag projection, sunset deadline, tide windows for the cuts you'd actually use. Quiet when there's nothing to say.

⚓

An alarm that wakes you

Anchor watch escalates — push, then SMS, then email — until you acknowledge. A dragging anchor at 03:00 is exactly when a phone alert earns its keep. Custom rules let you do the same for low voltage, gusts, depth-below-keel.

New · v0.11 Marlinspike

Turn any day at sea into a 30-second video.

One click in the dashboard turns a tracked passage into a polished, shareable video — your real heading, your real speed, your real distance, with the boat retracing the route. Pick vertical for Reels and TikTok or widescreen for YouTube. No editor, no plugin, no upload.

See how it works → Try It FREE

New

Never miss the next drawbridge.

Cruising the ICW means timing bascules. Sealink answers it on every fix — the next drawbridge ahead, when it next opens (current 33 CFR §117.261 schedule, rush-hour aware), your distance and ETA along the channel, and whether your air draft even needs it. 130 mileposted spans from Norfolk to Miami, on a centerline built from OpenStreetMap plus the Sealink fleet's own cruise tracks.

See it live → Browse the Directory Try It FREE

Next draw

Las Olas Blvd., Ft. Lauderdale

2.3 nm · mi 1064 · VHF 09

Opens: 2:15 PM (in 10 min)

Must open · 12 ft MHW

Why Sealink

The boat is the source of truth.

We don't pull predictions from a generic model and hope. We learn from the boat, the anchorage, and the fleet — and the captain inherits all of it.

🌊

Tides learned from your own anchorage

We fit a four-component harmonic model (M2, S2, K1, O1 — the same constituents NOAA uses) to your depth sensor. Confirmed boats publish their fits to a crowdsourced map, so the next captain into Hawksbill Cay gets predictions on day one. No tide tables, no chart-datum translation, no NOAA station three islands away.

🎯

Your boat's polar, not the brochure's

SailPrint correlates your true wind, boat speed, and heading in real time and builds a performance fingerprint of this hull — fouling, sail inventory, weight distribution and all. Better than manufacturer numbers nobody trusts. Improves every passage.

🗒️

Voyage notes that capture the moment

Pin a note, photo, or full sensor snapshot anywhere on your track. Sealink remembers the wind, depth, tide, and forecast at that instant. Years later you'll still know what the approach actually looked like.

📥

Installs as an app. Stays useful offline.

Add it to your home screen on phone, tablet, or laptop. Cached charts and the most recent readings stay available when the bars drop to one — and the dashboard reconnects the moment signal returns.

How it works

Three steps. Not three weekends.

If you already have a SignalK server on board, you're 15 minutes from a streaming dashboard. No instruments yet? You can start with just your phone's location — see below.

Install the plugin

One install from the SignalK Appstore. Auto-discovers every sensor on the bus — no manual mapping, no key picking. Works on Cerbo GX or a Pi 5 + Actisense NGT-1.

Open the dashboard

Sign in, watch your live data populate. Add it to the home screen on every device the crew uses. Setup wizard walks you through the rest — maybe five minutes.

Sleep better

Arm the anchor alarm. Let the co-captain ride along. Glance at the dashboard from the dinner table when something feels off. That's the whole job.

Step-by-step install guide →

No SignalK server on board? SeaNode — our plug-and-play marine appliance — is coming soon. Pre-flashed, NMEA-ready, ships paired to your SeaLink account.

Want to see it work first? Open SeaLink on your phone and use this device's location to light up the map, tides, weather, and Nearby Bridges right now — no instruments needed. It's a starter, not the real thing: phone GPS wanders, sleeps when your screen does, and brings no depth, wind, or overnight anchor watch. For that, your boat's own instruments are the source of truth.

Pricing

Free during beta. Three plans at launch, plus optional hardware.

Subscriptions are software-only — your boat needs a way to send data to SeaLink, either via the free SignalK plugin on a Cerbo GX / Pi 5, or via the SeaNode appliance (no Pi required).
Every BETA account gets the full PRO suite at no charge until prices land.

SeaNode Soon

TBD / hardware

The bridge: plugs into your boat's NMEA bus and streams data to your SeaLink account. No Pi, no SignalK setup.

Reads NMEA 0183 + 2000
Pushes to SeaLink over Wi-Fi / cell
Pre-paired to your account
Rebroadcasts to phones / plotters
Fanless marine build

Join waitlist

Explorer Free

$0 / forever

One boat. Live dashboard, anchor alarm, tide & weather. Bring your own SignalK or a SeaNode.

1 vessel + PWA app
Anchor alarm
Tide, weather, polar
Voyage logs + community POIs

PRO Free in BETA

TBD / mo · 1 boat

Everything in Explorer, plus the maintenance suite.

Maintenance + service log
Asset tracking (sails, EPIRB, engines…)
Co-Captain briefings
Unlimited crew + API
1-year retention

Try free in BETA

FLEET Soon

TBD / boat / mo

Charter, management, schools. Many boats, one map.

Unlimited vessels
Fleet map + geofencing
Charter handoff + guest QR
Owner-branded PDFs
Webhooks + bulk ops

Get notified

Beta users grandfathered. Your Explorer keeps unlimited crew, full retention, and API access — whatever new signups get later.

Get your boat watching itself.

It takes about 15 minutes from "what's a SignalK plugin" to a streaming dashboard. Free, all features, no card.

Born at sea, built for sailors.
Designed and built aboard a 1986 Nauticat 44 named ETSIA.
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