Garmin GPSMAP 820xs Manual

The Garmin GPSMAP 820xs is a high-performance, 8-inch touchscreen chartplotter designed for marine navigation. It features built-in BlueChart g3 coastal charts, support for Garmin CHIRP traditional, CHIRP ClearVü, and CHIRP SideVü sonar, built-in Wi-Fi for connectivity, NMEA 2000 and NMEA 0183 support, and compatibility with Garmin radar, autopilots, and other marine networks. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: 8-inch sunlight-readable touchscreen display, Power/NMEA 2000 cable, Mounting hardware, Protective cover.

Feature	Description
Display	8-inch WVGA (800 x 480 pixels) touchscreen, sunlight readable
Preloaded Charts	Built-in BlueChart g3 coastal charts
Sonar Support	CHIRP traditional, CHIRP ClearVü, CHIRP SideVü
Connectivity	Built-in Wi-Fi, NMEA 2000 & NMEA 0183 support
Power Input	10–35 Vdc
Water Rating	IPX7 (submersible to 1 meter for 30 minutes)
Mounting	Flush mount or bracket mount options
Audio	Built-in speaker for audible alerts
Storage	microSD card slot for additional charts/data
Compatibility	Garmin radar, autopilots, instruments, cameras

Installation

Unpack and inspect contents. Choose mounting location with clear view and easy access.

1. Mounting: Use included template to mark holes. Drill holes and secure mount using provided hardware.
2. Power Connection: Connect red wire to positive (+) battery terminal, black wire to negative (-) terminal, and bare wire to ground.
3. NMEA 2000 Network: Connect the included NMEA 2000 drop cable to the device and your vessel's NMEA 2000 backbone.
4. Sonar Transducer: Connect compatible Garmin transducer to the appropriate port.
5. Secure Cables: Route and secure all cables away from moving parts and heat sources.

WARNING! Disconnect power before installation. Ensure all connections are waterproof and secure. Follow all safety guidelines for marine electrical systems.

First-Time Setup

Apply power to the device. Follow on-screen prompts.

1. Language/Units: Select preferred language and navigation units (nautical miles, statute miles, kilometers).
2. Agreements: Read and accept the software license agreement.
3. Initial Position: Allow the device to acquire GPS satellite signals outdoors with a clear view of the sky.
4. Network Setup: Configure Wi-Fi to connect to a mobile device for ActiveCaptain app integration.
5. System Settings: Set time, date, backlight level, and audible alerts.
6. Sonar Setup: Run the transducer wizard to configure connected sonar.

CAUTION! Ensure the device is securely mounted before operating the vessel.

Specifications

• Display Size: 8 inches diagonal.
• Display Resolution: 800 x 480 pixels.
• Touchscreen: Capacitive, multi-touch.
• Waterproof Standard: IPX7.
• Power Supply: 10–35 Vdc.
• Max Power Consumption: 2.5 A @ 12 Vdc.
• GPS Receiver: Built-in high-sensitivity GPS/GLONASS.
• Internal Memory: For system software and preloaded charts.
• Expansion Slot: microSD card.
• Operating Temperature: -15° to 55°C (5° to 131°F).
• Compass Safe Distance: 30 cm (11.8 in.).

Controls and Settings

Primary control is via the touchscreen interface. Physical Power button on the front.

Home Screen: Provides quick access to Navigation, Sonar, Radar, Media, and Settings.

Settings Menu: Access via the wrench icon. Key categories include:
System: Display, Sounds, Language, Units, Network (Wi-Fi, NMEA).
Navigation: Chart appearance, Route options, Alarms (anchor drag, arrival).
Sonar: Frequency, Range, Gain, Color Scheme, Split-screen views.
Communications: NMEA 2000 device list, NMEA 0183 settings.
Software Update: Check for updates via Wi-Fi.

Connecting Devices

The GPSMAP 820xs serves as a hub for your marine network.

1. NMEA 2000: Connect to engine data, fuel flow, wind, depth, speed instruments.
2. Radar: Connect compatible Garmin radar (e.g., GMR Fantom) via Ethernet cable.
3. Autopilot: Interface with a compatible Garmin autopilot for course control.
4. VHF Radio: Connect a NMEA 2000-compatible VHF for DSC distress calling and position sharing.
5. Cameras: Connect compatible Garmin cameras (e.g., Garmin Surround Vision).
6. ActiveCaptain: Use Wi-Fi to pair with the ActiveCaptain app on a smartphone or tablet for remote control, smart notifications, and easy chart updates.

Tip: Always power down the chartplotter and connected devices before making or breaking connections.

Navigation & Chartplotting

Utilize preloaded BlueChart g3 maps for detailed coastal navigation.

1. Viewing the Chart: Pan by dragging the screen. Zoom in/out with a pinch gesture or the +/- buttons.
2. Creating a Waypoint: Touch and hold a location on the chart, then select "Save as Waypoint."
3. Creating a Route: Select Navigation > Route > Create Route. Tap points on the chart to add route points.
4. Following a Route: Select a route from the list and press "Go."
5. Tracks: The device automatically records your track. View and manage tracks in the Tracks menu.
6. Fish Finder: Mark fishing spots by creating a waypoint or using the Sonar screen's mark function.
7. Man Overboard (MOB): Press and hold the Power button or use the on-screen MOB button to instantly mark and navigate back to a person's location.

WARNING! Always maintain situational awareness. Use this device as an aid to navigation, not as your sole source of information.

Sonar Features

With a compatible transducer, access advanced sonar views.

• Traditional Sonar: Displays a detailed view of what is directly below your boat using CHIRP technology for superior target separation.
• ClearVü Scanning Sonar: Provides a nearly photographic, detailed image of structure and fish below and to the sides of your boat.
• SideVü Scanning Sonar: Delivers a detailed view of structure and fish to the left and right of your boat's path.
• Split-Screen Views: View any combination of sonar views simultaneously.
• A-Scope & Fish Symbols: Customize the display with an A-Scope (real-time water column view) and enable/disable fish symbols.

Access sonar settings from the Sonar menu to adjust frequency, range, gain, and palette for optimal viewing conditions.

Care & Cleaning

Disconnect power before cleaning.

1. Screen: Use a soft, lint-free cloth lightly dampened with fresh water. Do not use chemicals, window cleaners, or abrasives.
2. Case: Wipe with a soft cloth dampened with mild soap and fresh water. Rinse with a cloth dampened with fresh water only.
3. Connectors: Keep free of dirt and corrosion. Apply a dielectric grease to connectors if recommended.

CAUTION! Never use harsh chemicals, solvents, or pressurized water. Do not submerge the unit beyond its rated depth. Ensure unit is dry before reconnecting power.

Regulatory Information

This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. This device meets applicable Innovation, Science and Economic Development Canada licence-exempt RSS standard(s). Contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada's licence-exempt RSS(s).

© 2025 Garmin Ltd. or its subsidiaries. All rights reserved. Garmin, GPSMAP, BlueChart, ClearVü, SideVü, and ActiveCaptain are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries.

For the latest software, manuals, and support, visit support.garmin.com or contact Garmin Product Support.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No Power	Blown fuse, loose connection, dead battery	Check fuse on power cable. Verify secure connections at battery and device. Check vessel battery voltage.
Poor GPS Accuracy/No Fix	Blocked satellite view, outdated software	Ensure clear view of sky. Allow several minutes for initial fix. Update software via Wi-Fi.
Touchscreen Unresponsive	Screen protector, wet screen, software issue	Remove aftermarket screen protector. Dry screen completely. Restart device.
No Sonar Signal	Transducer not connected/selected, incorrect settings	Verify transducer is connected and selected in Sonar Settings. Ensure boat is in water deep enough for signal.
Wi-Fi Not Connecting	Out of range, incorrect password, interference	Ensure mobile device is within range. Re-enter password. Restart both devices.
NMEA 2000 Devices Not Shown	Network power issue, loose termination	Check NMEA 2000 network power. Ensure backbone is properly terminated at both ends.
Chart Not Displaying Detail	Zoom level, chart region not loaded	Zoom in closer. Verify you are in an area covered by preloaded charts. Insert microSD card with detailed regional charts if needed.

Reset: Settings > System > Reset > Restore Defaults. (Note: This will erase user waypoints, routes, and tracks unless backed up.)

Service: For technical support, visit support.garmin.com or contact your local Garmin dealer.