Hi Chuck, Unfortunately there is no way to do a master reset to default values on the IC-F21GM. How do I know this? I asked Icom Support directly. There is nothing in the manual that mentions a reset either. I too had wondered if this was possible and meant to ask Icom some time ago. Your question spurred me to go ahead and do it. There are many things you cannot do with the F21GM and this is just another one. My previous question to them asked if there was ANY method of telling what channel a received signal was on when in the scan mode. There is no method other than manually scanning through the channels and getting lucky by hearing the same signal again...if it's still there. You give up some bells and whistles with the base model radio. I do not have the programming software and programmed in a local repeater manually on a single channel. To say the least, it is tedious and not always successful. To return to default values, you'll need to re-program the user-programmed channels back to what would have been there by default. Icom referred me to the "Setting CTCSS Tones" chart for help. Sorry this is probably not the answer you wanted, but there it is. Chris Hoffman
