Messages

I have recently downloaded Locus Pro, and I wanted to use it as a car navigator for a holiday in New York. It is important to me being able to navigate offline and also doing address search offline. After I downloaded the offline map from Mapquest, I went into offline search either by using names or coordinates. Neither of them work. Is it because that i need to download other than maps in order to do search based on either GPS coordinate or street search? Can anybody give a new user like me some advices and safe my holidays? Thanks.