. However, because it is no longer supported, it is used at the owner's risk. Key Technical Considerations
: One of the most popular "free" hacks for the GM300 is expanding a 2-channel or 8-channel radio to 16 channels. While Radio Doctor can sometimes assist, this often requires specific bit-masking techniques within the software. Important Warning The GM300 is a crystal-filter synthesized
If you are programming a GM300 for use today, remember that most of these radios were manufactured before the FCC "Narrowbanding" mandate (2013).