FWIW, I've had my TRX-1 for a couple of years. Initially I was very unimpressed with it. I monitor aircraft and railroads primarily and the performance was much less impressive than my GRE PSR-500 hand held. As the firmware updates came out, I discovered the performance improved with each update. I have never tried to program using Zip Codes but using the specific information from the Data Base. It has sometimes taken some research to find the data I was looking for but using some creativity I have been able to locate any information I wanted. I have also started to mix trunking talk groups with conventional channels for both railroads and some airports where their operations and Crash Fire Rescue personnel work on a trunked system. That approach seems to work well for me.
Be persistent and don't hesitate to ask in this forum for help. There's some very knowledgeable resources here... Have fun!
Be persistent and don't hesitate to ask in this forum for help. There's some very knowledgeable resources here... Have fun!