Installation & Setup Nightscout

⚡ Quick Setup Guide

1

Install App

• Open Garmin Connect IQ Store
• Search "CGM+ GB"
• Download & sync to watch

2

Get Nightscout URL

• Have your Nightscout URL ready
• Generate a new subject under Admin Tools with "readable" role
• Copy the access token

3

Configure App

• Open Garmin Connect IQ
• Find app in My Devices
• Enter Nightscout URL
• Enter Access Token (if required)

⏱️ Total time: 5-10 minutes • 📖 See detailed steps below

Step 1: Install the CGM App

Open the Garmin Connect IQ Store on your phone or visit apps.garmin.com
Search for "CGM+ GB"
Tap Download or Install
Wait for the app to sync to your Garmin device (this may take a few minutes)

Note: Make sure your Garmin device is connected to your phone via Bluetooth and the Garmin Connect app is running during installation. If the installation gets stuck, restart the Garmin IQ app on your phone.

Step 2: Prepare Your Nightscout Information

The CGM app connects directly to your Nightscout site to fetch your glucose data. You'll need your Nightscout URL and optionally your API secret.

What You Need

Nightscout URL: Your complete Nightscout site address
Example: https://yourname.herokuapp.com or https://yourname.fly.dev
Access Token: An access token that can be generated under Admin Tools
You can use your admin api token, but I recommend creating a "Subject" under Admin-Tools. This creates an access token just for this app with read-only access

Generating Your Access Token

To securely connect the app to your Nightscout site, create an access token:

Log in to your Nightscout site
Click on the hamburger menu (three horizontal lines) in the top right
Navigate to Admin Tools
Go to Subjects - People, Devices, etc
Click Add new Subject (or similar button)
Give it a name like "Garmin Watch" or "CGM App"
Assign the readable role (at minimum)
Click Save
Click on the access token to view the full token
Copy this token - you'll need to enter it in the app settings

💡 Tip: Each subject has a unique access token that can be shared. Using tokens instead of your main API_SECRET is more secure and allows you to revoke access for specific devices if needed.

Creating a new subject with access token

Copy the access token in the settings

Step 3: Enter Your Nightscout Information in the CGM+ GB settings

Now you need to configure the CGM+ app with your Nightscout site information.

Open the Garmin Connect IQ app on your phone
Tap My Devices at the bottom
Select your Garmin watch from the list
Tap Apps
Find and tap CGM+ GB
Tap Settings
Select Nightscout under "CGM System"
Enter your URL in the Username / URL field
- Include the full URL: https://yourname.herokuapp.com
- Do NOT include /api/v1 or any path - just the base URL
- Make sure it starts with https://
Enter your API Secret (if required)
- Leave blank if your Nightscout site is publicly readable
- Enter your Access Token if authentication is required
Tap Save
Sync your settings to your watch by pulling down to refresh in Garmin Connect

✓ Success! Once configured, the app will automatically connect to your Nightscout site and start displaying your glucose data

Nightscout settings in Garmin Connect IQ

Nightscout configuration in the app settings

Troubleshooting

If you're not seeing glucose data after 10 minutes:

Verify your Nightscout URL is correct (including https://)
Check that your Nightscout site is online and accessible in a browser
If using API secret, double-check it matches your Nightscout configuration
Ensure your watch is connected to your phone via Bluetooth
Make sure your phone has an active internet connection
Check that your Nightscout site has recent data (within last 15 minutes)
Try restarting the Garmin Connect app and re-syncing

See the Error Codes page for detailed troubleshooting steps.

Nightscout - Installation & Setup