(1) Mobile engagement with static advertising
Digital strategy involves merging content and engagement practices. Using an 'on entry' geofence create a campaign in parallel with billboard advertising or bus stop advertising. Basically where ever you have static advertising content you can create a campaign that allows mobile users to interact and engage with static advertising campaigns.
(2) Working with consumer brands
Brands can use both 'on entry' and 'on exit' geofence(s) to send campaigns to their users in context with their surroundings. If your brand is a drinks company, use an 'on entry' geofence(s) to offer customers 'a drink on the house' as they enter or leave the venue.