If you're unable to activate Synthetic Vision on your iPhone, try these troubleshooting steps.
STEP 1: Is Synthetic Vision included in your plan?
Synthetic Vision for iPhone requires an active ForeFlight Pro Plus, Performance Plus, or Business account with Synthetic Vision added on. If you currently don't have one of these plans and would like to upgrade, please visit this link: foreflight.com/pricing
If your plan does not include Synthetic Vision, you'll still be able to utilize the backup attitude indicator with a supported AHRS device.
iPhone Backup Attitude Indicator Displays
STEP 2: Do you currently have ForeFlight version 10.5 or higher installed?
Synthetic Vision for iPhone requires ForeFlight Mobile EFB version 10.5 or higher. You can check to see what version of ForeFlight you have installed by opening ForeFlight Mobile EFB and selecting More > About. If you don't have ForeFlight version 10.5 or higher, you can update your version of ForeFlight from the Apple App Store. See this link for more information.
STEP 3: Do you have an iPhone 5, 5s, or SE?
Synthetic Vision for iPhone is unavailable on the iPhone 5, iPhone 5s, or iPhone SE.
STEP 4: Do you have High-Resolution Terrain downloaded?
Synthetic Vision requires high-resolution terrain downloaded to your device in order to work properly. You can download high-resolution terrain by selecting More > Downloads > Data Settings and toggling the High Resolution Basemap and Terrain data for your region.
Once you've selected your regions, tap the Downloads back button to go back to the Downloads view. Tap the blue Download button to download the High-Resolution Terrain data.
STEP 5: Is your iPhone's display set to Standard?
Synthetic Vision for iPhone may require that your display is set to Standard. To check your settings, follow these steps:
1. Open your iPhone's Settings app and select Display & Brightness.
2. Select Display Zoom.
3. Select Standard.
4. Save your setting by selecting Set.
iPhone Settings > Display & Brightness > Display Zoom > Standard