Garmin OnDeck Hub and ActiveCaptain App: Remote Boat Monitoring Explained
Watch: Overview of the Garmin OnDeck Hub and how it integrates with the ActiveCaptain app for remote boat monitoring.
Leaving your boat at a marina or on a mooring for days or weeks at a time means trusting that everything is fine when you're not there to check. The bilge pump could be cycling continuously. The battery could be draining. Someone could be boarding without permission. You wouldn't know any of it until you arrived at the dock.
The Garmin OnDeck Hub is designed to close that gap — giving you real-time visibility into your boat's critical systems from your phone, anywhere in the world. Combined with the ActiveCaptain app's community features, trip planning tools, and wireless chart updates, it represents the most complete connected boating platform currently available for recreational boaters.
This guide covers how the OnDeck Hub works, what the ActiveCaptain app does beyond boat monitoring, and how the two systems work together. To explore related smart boat technology, see our guides on Choosing a SEND Device, the Fell Marine Virtual Kill Switch, and Siren Marine MTC boat monitoring.
What Is the Garmin OnDeck Hub?
The Garmin OnDeck Hub is a cellular-connected boat monitoring device that installs permanently aboard your vessel and communicates with your smartphone via the ActiveCaptain app. It gives you the ability to check on — and in some cases control — key onboard systems without being physically present on the boat.
Operation requires an ActiveCaptain subscription. Once active, the system delivers alerts and status updates to your phone or tablet via text message and in-app notifications, regardless of where you are relative to the boat.
Built-In GPS Tracking
The OnDeck Hub includes an integrated GPS receiver that updates your vessel's position every 15 minutes when connected to shore power, or every 30 minutes when running on backup battery. This means you always have a current location for your boat — useful both for routine check-ins and for immediate response if the boat is moved without authorization.
Sensor-Based System Monitoring
Beyond GPS, the OnDeck Hub supports up to five optional sensors that you select and install based on what you want to monitor. Sensors are sold separately, which lets you build the monitoring setup that fits your boat and budget. Available sensor categories include:
- Bilge pump activity — get alerted if your bilge is cycling more frequently than normal, which can indicate a leak before it becomes serious
- Battery voltage — monitor charge levels and get low-voltage alerts before you arrive to a dead battery
- Temperature — track onboard temperature for refrigeration systems, engine compartments, or climate-sensitive equipment
- Motion and security — detect unauthorized boarding or movement aboard the vessel
- Additional accessories — compatible with select appliances including ice makers
All sensor data is viewable in the ActiveCaptain app and can be configured to send alerts when readings cross thresholds you define — for example, triggering a notification when battery voltage drops below 12.2V or when the bilge pump cycles more than three times per hour.
Remote Control via the ActiveCaptain App
Depending on which sensors and accessories are installed, the OnDeck Hub allows limited remote control functions through the app — not just passive monitoring. Combined with the app's chartplotter integration (covered below), this moves the system toward genuine remote boat management rather than simple status reporting.
What the OnDeck Hub Does Not Replace
The OnDeck Hub is a monitoring and alerting system — it is not a substitute for a proper bilge pump with automatic float switch, a battery management system, or a dedicated security system. It is best understood as a remote awareness layer that lets you catch problems early and respond before they become emergencies. For emergency distress signaling, see our guide on Personal Locator Beacons and EPIRBs and PLBs.
What Is the ActiveCaptain App?
ActiveCaptain started as an independent boating community website in 2007, built around the idea that boaters helping boaters produces better on-the-water intelligence than any single data source. Garmin acquired ActiveCaptain in 2017 and integrated it into their marine electronics ecosystem. Today the platform combines a community of hundreds of thousands of boaters with direct integration into Garmin chartplotters — covering more than 17,800 marinas and 12,800 anchorages worldwide.
Chartplotter Integration and Wireless Chart Updates
Pair the ActiveCaptain app with a compatible Garmin chartplotter and it becomes the wireless bridge between your phone and your navigation system. The OneChart feature lets you access, purchase, and update all your charts directly from the app — no SD card shuttle between the boat and your computer required. Chart updates and software patches for compatible Garmin chartplotters push over the air through the app automatically once pairing is established.
Trip Planning and Waypoint Sync
Plan routes, mark waypoints, and pre-fish lakes in the ActiveCaptain app from anywhere — at home the night before, or at the dock in the morning. Everything you create in the app syncs automatically to your paired Garmin chartplotter. Waypoints and routes transfer seamlessly in both directions, so marks you create on the chartplotter while underway also appear in the app for later review or sharing.
Community Intelligence — Marinas, Anchorages, and Hazards
The ActiveCaptain community database is the platform's most differentiating feature for cruising and passage-planning boaters. Members contribute real-time, firsthand reports on:
- Marina reviews, slip availability, fuel pricing, and amenities
- Anchorage conditions, holding quality, and local hazards
- Shallow water and chart errors not yet reflected in official publications
- Local points of interest accessible by dinghy or tender
This kind of cruising intelligence — water depth at a specific marina entrance on a falling tide, or which anchorage has poor holding in northerly winds — is simply not available from official chart sources. The community layer turns ActiveCaptain into something closer to a cruising guide that updates in real time.
The Boat Card and Social Features
Every ActiveCaptain user creates a Boat Card — a digital profile that includes vessel details, home port, and contact preferences. The Boat Card functions as your identity within the community: you use it to post marina reviews, connect with other boaters, join interest groups, and receive community notifications for areas you're cruising through. Marinas can also maintain their own profiles, including current fuel prices and slip availability.
Marina Partner Program and 1st Choice Recognition
Marinas participating in the ActiveCaptain platform can manage their listings directly through the app — updating fuel prices, editing facility information, and reaching boaters through the Marina Minute, a weekly digest distributed to the community. The ActiveCaptain 1st Choice program recognizes marinas that have earned a 4.0-star average or higher with five or more verified community reviews, giving boaters a reliable quality signal when choosing where to stop.
OnDeck Hub and ActiveCaptain: How the Two Systems Work Together
The OnDeck Hub and ActiveCaptain app are designed as a unified system rather than separate products. The app is the interface for everything the Hub does — all sensor alerts, GPS position updates, and remote control functions surface in ActiveCaptain, alongside the community features, chart management, and chartplotter integration.
For boaters who already use a Garmin chartplotter with ActiveCaptain, adding an OnDeck Hub extends the platform from underway navigation to dockside and at-anchor monitoring. The same app that plans your trip and updates your charts also tells you at 2am that the bilge pump has been running for 20 minutes — and gives you a GPS coordinate for exactly where the boat is.
Garmin has also been expanding ActiveCaptain compatibility across their product line, including their first trolling motor — moving toward a single wireless interface for an increasing number of onboard systems.
Compatibility: What to Check Before You Buy
The OnDeck Hub works with compatible Garmin chartplotters that support the ActiveCaptain platform. Before purchasing, verify:
- Your Garmin chartplotter model appears on Garmin's current ActiveCaptain compatibility list
- You have a cellular data plan and smartphone capable of running the ActiveCaptain app (available for iOS and Android)
- You understand which sensors are included with the Hub vs. sold separately, and that the cellular subscription for OnDeck is separate from ActiveCaptain's community features
If you have questions about whether the OnDeck Hub is compatible with your existing Garmin electronics, the advisors at any West Marine store can confirm compatibility and walk you through the sensor options that make sense for your specific vessel and usage pattern.
Related Smart Boat Technology Guides
- Choosing a SEND Device
- Fell Marine Virtual Kill Switch
- Marine Traffic AIS App
- Siren Marine MTC Boat Monitoring
- Selecting an Emergency Beacon — EPIRBs and PLBs
- Personal Locator Beacons for Boating
- 20 Common Boating Mistakes — and How to Avoid Them
Browse Marine Electronics at West Marine
- Chartplotters, GPS units, and integrated navigation displays
- Onboard monitoring and security systems
- VHF radios, AIS, and satellite communication
- Sonar, CHIRP, and fish-finding electronics
- Autopilot systems and steering control
- Paper and electronic navigation charts
Garmin OnDeck and ActiveCaptain — Frequently Asked Questions
What is the Garmin OnDeck Hub?
The Garmin OnDeck Hub is a cellular-connected boat monitoring device that installs permanently aboard your vessel. It uses an ActiveCaptain subscription to deliver GPS position updates, sensor alerts, and remote monitoring data to your smartphone or tablet via the ActiveCaptain app — from anywhere with cellular service.
What sensors can I connect to the OnDeck Hub?
The Hub supports up to five optional sensors sold separately. Available sensor categories include bilge pump activity, battery voltage, temperature, motion and security detection, and compatible appliances such as ice makers. You select and install only the sensors that match your monitoring priorities.
How often does the OnDeck Hub update my boat's GPS position?
Position updates every 15 minutes when the Hub is connected to shore power, and every 30 minutes when running on backup battery. This gives you a reliable, current location for your vessel whether it's at a slip, on a mooring, or anchored.
Does the OnDeck Hub require a subscription?
Yes. Active operation of the OnDeck Hub requires a subscription to the ActiveCaptain service. The subscription covers the cellular data connection that transmits GPS and sensor data to your phone. The ActiveCaptain community features (marina reviews, anchorage guides, hazard reports) are available separately within the app.
What is the ActiveCaptain community?
ActiveCaptain is a user-driven boating community with hundreds of thousands of members contributing reviews, hazard reports, marina information, and anchorage conditions across more than 17,800 marinas and 12,800 anchorages worldwide. It started as an independent website in 2007 and was acquired by Garmin in 2017. Boaters create a Boat Card — a digital profile — to post reviews, join groups, and connect with other cruisers in areas they're visiting.
Can I update my Garmin chartplotter charts wirelessly through ActiveCaptain?
Yes. The OneChart feature in ActiveCaptain enables wireless chart and software updates for compatible Garmin chartplotters. Once your chartplotter is paired with the app, updates push over the air without requiring an SD card. You can also purchase new charts directly through the app for use on your chartplotter.
Can I plan routes in ActiveCaptain and have them appear on my chartplotter?
Yes. Routes, waypoints, and marks created in the ActiveCaptain app sync automatically to your paired Garmin chartplotter. The sync works bidirectionally — waypoints created on the chartplotter while underway also appear in the app. This lets you plan trips at home and have everything ready on the chartplotter when you arrive at the boat.
What mobile devices work with the ActiveCaptain app?
ActiveCaptain is available for both iOS and Android smartphones and tablets. An internet connection is required for community features, chart updates, and OnDeck monitoring functions.
What is the ActiveCaptain 1st Choice marina program?
The 1st Choice designation recognizes marinas in the ActiveCaptain database that have earned a 4.0-star average rating or higher from a minimum of five verified community reviews. It gives boaters a trusted quality benchmark when choosing where to dock, fuel, or overnight in unfamiliar areas.
Is the OnDeck Hub compatible with all Garmin chartplotters?
The Hub integrates with Garmin chartplotters that support the ActiveCaptain platform. Compatibility varies by model and software version. Before purchasing, verify your specific chartplotter model against Garmin's current ActiveCaptain compatibility list, or ask an advisor at your nearest West Marine store.