To view the Attitude Indicator/Synthetic Vision feature, open ForeFlight Mobile on your iPad and go to the Maps page. Tap the Attitude Indicator/Synthetic Vision (SV) button 
at the top of the Maps page to view the Attitude Indicator display.
Image 1. Attitude Indicator with Synthetic Vision subscription but no AHRS input.
Image 2. Attitude Indicator with GPS input but no Synthetic Vision subscription nor AHRS input.