Drool... Such a map would certainly be cool. But more importantly, background full-spectrum search would make it possible to have a tuner store ten strongest local stations (unique, if they use RDS AF) in a 'transient' bank (say, D, or C if that's problem) instantly. I like that 'find me strongest stations' feature most car radios have, as, when I travel, I like to sample local stations, not just follow a handfull of those with national coverage.