been trying to find frequencies for anne arundel county police, when ftying to manually load 854.73750 keep getting error code any know what i,am doing wrong
I suspect you mean a PRO-405; even though the wiki says you can enter this frequency, you won't be able to monitor this system with it. The Anne Arundel system uses digital trunking, and the 405 isn't a trunking scanner.
You would need one of the digital trunktrackers to properly hear this system;