Ingress Portal Scanner for Reswue. Intended use - to help locate portals in remote, low signal/satellite only areas. You mark them as alerts in a Reswue operation before you go, and then the app alerts you as you approach by vibration and sound, so you do not have to look at the phone when you cannot - like if you are riding a bike, driving or running.
It supports two level of alerts: ~500m when portal supposed to become visible on scanner and ~50m when in range. Distances are adjustable.