Troubleshooting : Scan Mode, Nothing to Scan 1. Make sure you Set Your Location to scan the Database. 2. Make sure Favorites Lists are enabled in Set Scan Selection. 3. Make sure Service Types are enabled for the Channels you want to hear. 4. Make sure you have locations programed if Use Location Control is On. 5. Make sure longitude and latitude are N and W (for N America). 6. Make sure Systems/Departments/Channels are not Avoided. 7. Make sure Favorites List/System quick key is enabled. 8. (Search with Scan) Make sure Troubleshooting Search with Scan is enabled in Select Lists to Monitor and the Search for Menu and for the Custom Search. With Scanning Interrupted 1. Turn off Priority Scan. Change Priority Interval. 2. Turn off Close Call Priority. 3. Turn off Weather Priority. 4. Set Channel Delay longer. 5. Set positive Channel Delay. All Channels Out of Range 1. Increase your range. 2. Turn Location Control off for the Favorites List.. Backlit Keypad & LCD. Simple-to-use Sentinel PC Software keep your scanner?s database and firmware up to date. Instant Replay - Plays back up to 240 seconds (4 minutes) of the most recent transmissions. Audio Recording - Capture transmissions for later playback.