Your boat or RV, watching itself — wherever you are.
Drag at anchor, and Guardian alerts you — and your partner, your crew, the neighbor two slips down — the drag alarm is free on every plan. High water in the bilge? You know in seconds. Batteries, shore power, and climate are watched around the clock — and paid plans add the city-water valve that shuts a burst line down automatically. All on affordable off-the-shelf sensors — no proprietary black boxes.
- 🆓 Free to start, real protection
- 🛠️ Off-the-shelf hardware
- 🤝 Built with its community
- 💻 Web · desktop · Android
What's at stake
The failures that ruin a trip — or total a vessel — are almost always quiet ones. They happen while you're asleep, at the office, or three states away.
Is it still where you left it?
An anchor drags at 2 a.m. A trailer rolls out of a storage lot. Guardian's anchor watch and security zone turn "I hope it's fine" into an alert the moment something moves.
A dead battery is a dead bilge pump
Lose your 12V system and you lose the bilge pump, the fridge, and your safety electronics. On the water, a flat house bank can quietly become an emergency.
Shore power drops silently
A tripped pedestal at the marina or campground kills your charging and refrigeration — and you won't know until the food spoils or the batteries are flat.
Water rising where it shouldn't
Rain past a failed cover, a weeping stuffing box, a bilge pump that quietly lost the battle — high water is the failure every boat eventually meets. And on a city-water hookup, a burst hose can push hundreds of gallons in.
Two paths to protection — local and cloud
Guardian turns the same affordable sensors used in millions of homes — LinkTap and Shelly — into a purpose-built system for vessels and rigs. Aboard, the app talks to them directly. Away, the cloud watches for you.
Sense
Flood sensors, voltage monitors, power meters, and GPS watch the systems that matter.
Decide
The app — on your phone, laptop, or nav station — tracks every reading in real time.
Act
A dragging anchor or rising bilge alerts everyone the boat is shared with, and on paid plans the city-water valve closes automatically on a flood.
One dashboard for everything
Water, power, climate, location, and security — monitored locally when you're aboard, and over the cloud when you're not.
Anchor watch & security
A drag alarm free on every plan — and the alert reaches everyone the boat is shared with, not just you. Plus a geofence that flags theft, presence modes, and camera motion alerts.
Power health
Track house and starter banks with chemistry presets, and know the moment shore power drops — so a dead battery never strands you.
Flood & bilge alarms
A high-water sensor in the bilge or under a sink alerts you in seconds, on every plan. On a paid plan with city water, the LinkTap valve slams shut automatically on a flood alarm.
Climate
Temperature and humidity sensing catches a coming freeze or a failed fridge before it costs you a plumbing system or a provisioning run.
Alerts that reach you
A flood at 2 a.m. is on your phone seconds later — app closed, three states away, on every plan including Dockside.
Works offline
Aboard and off-grid, everything works with no internet at all — the marina Wi-Fi dying doesn't take your alarms with it.
Tailored to how you travel
The same system, tuned for the realities of life on the water and on the road.
For your boat
- Anchor & security watch Know if she drags at anchor or leaves the slip without you.
- Bilge pump readiness Keep batteries charged so the pump runs when it has to.
- Power assurance Know your charging is alive before you leave the slip.
- Freshwater burst mitigation On a dock hose, shut the water the moment a line lets go.
For your RV
- Theft security zone A geofence around the driveway or lot — if the rig leaves, you know.
- No dead batteries Catch deep discharge before it kills your bank or starter.
- Burst-pipe defense On a park hookup, limit damage from plumbing failures while you're out.
- Peace of mind Leave the campsite knowing the coach is watching itself.
Liveaboards, winter layup, full-timers, shared boats and small fleets — see how Guardian fits the way you actually use your rig.
Explore all use cases →Built by boaters and RVers, for boaters and RVers
Guardian started with a simple frustration: the gear to protect a vessel or rig was overpriced, locked down, and rented back to you by subscription. So we built the opposite.
💸 Free to run, no catch
Monitoring and alarms — the anchor alarm aboard, bilge and flood alerts, away push — cost nothing. Optional plans add the cloud watches, the city-water valve, automatic remote monitoring, more alert destinations, and history.
🛠️ No proprietary hardware
Guardian runs on affordable, off-the-shelf sensors and valves you buy once and own — no marine-priced black boxes.
🤝 A real community
Every fix, sensor, and feature comes from boaters and RVers on the Guardian forum — and the roadmap is public, from marina-wide hubs to an open, pluggable hub platform.
Ready to protect your rig?
Create a free account, pick your hardware, and travel knowing your vessel is watching itself.