Serenity

Serenity is a virtual assistant programmed by Crash to function on Ranger Team Catalyst's communication devices and any other devices connected to the Ranger operating system. Serenity assesses an older obsolete GPS frequency for private communication between team members. Additionally, Serenity allows access to a personal radio frequency used only between team members as another measure of private communication. This also allows for communication if the GPS signal is ever weakened.
  Ranger Outposts also serve as radio towers for broadcasting communication frequencies for Ranger Team Catalyst members.
  Its AI programming relies on the personalities of the Rangers and their families.