You can access the status of your Cortex Transponder system in the status bar at the top of the Handset screen. It also provides easy access for Stealth Mode to be toggled on and off.
At a glance, if all the status items presented are green you know your VHF, DSC and AIS systems are fully operational and AIS position reports are being transmitted automatically. If any are yellow, then your AIS transponder is either not fully configured, is in Stealth mode, or is currently joining the AIS network. A status or red typically means there is a problem that requires your attention e.g. if your antenna goes open circuit the VHF antenna check will display red.