In ForeFlight Mobile, the term “ownship” refers to either the GPS position of your aircraft or the ability to detect your ADS-B traffic target as being you.
Ownship refers to the presentation of an aircraft icon on the Maps view that represents your aircraft’s GPS position. To show or hide your ownship on the Maps view, go to More > Settings and set Enable Ownship as desired.
ADS-B Ownship Detection
Ownship detection refers to the detection of your aircraft as a traffic target in an ADS-B broadcast. Ownship detection occurs when ForeFlight’s proximity detection logic is able to determine that your ADS-B In received traffic target is your aircraft when compared to your aircraft’s GPS position.