User selects input tone (user transmit) for coverage area. User leaves the receiver on carrier squelch, however. Coverage area is indicated with colors. The number indicates which frequency to be on; 20 or 45 (147.20 or 145.45). Note: There is some overlap and lines are not very accurate. They are a general guideline. "Your mileage may vary". Tones are specified in "Coverage Areas". For more details, such as the frequencies, return to the main page and click on "Contact".20 coverage area lables:
In the event you are not familair with your radio's transmitter offset needed here's a handy chart.
In other words, 147.20 is positive offset, while 145.45 is negative offset.