just wondering if I don't have a computer and I go lets say to a difference town or city or a race track if I can just can hit scan and it will scan all the frequencies the per has or do I have to enter all the frequencies before i leave the house from the computer, the reason asking is because when at the races I never know what the frequencies are going to be until i get to the races and get a card that has the frequencies on them of the teams so obviously i don't wanna have to take my computer with me to the races to have enter these frequencies.